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<H1>SQUID Frequently Asked Questions</H1>

<H2>&copy; 2004 Team Squid, <CODE>info@squid-cache.org</CODE></H2>
<HR>
<EM>Frequently Asked Questions (with answers!) about the Squid Internet
Object Cache software.</EM>
<HR>
<P>You can download the FAQ as
<A HREF="FAQ_long.html">HTML</A>,
<A HREF="FAQ.pdf">PDF</A>, 
<A HREF="FAQ.ps.gz">compressed Postscript</A>, 
<A HREF="FAQ.txt">plain text</A>,
<A HREF="FAQ.sgml">linuxdoc SGML source</A> or as a
<A HREF="FAQ.tar.gz">compressed tar of HTML</A>.</P>
<P>
<H2><A NAME="toc1">1.</A> <A HREF="FAQ-1.html">About Squid, this FAQ, and other Squid information resources</A></H2>

<UL>
<LI><A NAME="toc1.1">1.1</A> <A HREF="FAQ-1.html#ss1.1">What is Squid?</A>
<LI><A NAME="toc1.2">1.2</A> <A HREF="FAQ-1.html#ss1.2">What is Internet object caching?</A>
<LI><A NAME="toc1.3">1.3</A> <A HREF="FAQ-1.html#ss1.3">Why is it called Squid?</A>
<LI><A NAME="toc1.4">1.4</A> <A HREF="FAQ-1.html#ss1.4">What is the latest version of Squid?</A>
<LI><A NAME="toc1.5">1.5</A> <A HREF="FAQ-1.html#ss1.5">Who is responsible for Squid?</A>
<LI><A NAME="toc1.6">1.6</A> <A HREF="FAQ-1.html#ss1.6">Where can I get Squid?</A>
<LI><A NAME="toc1.7">1.7</A> <A HREF="FAQ-1.html#ss1.7">What Operating Systems does Squid support?</A>
<LI><A NAME="toc1.8">1.8</A> <A HREF="FAQ-1.html#ss1.8">Does Squid run on Windows?</A>
<LI><A NAME="toc1.9">1.9</A> <A HREF="FAQ-1.html#ss1.9">What Squid mailing lists are available?</A>
<LI><A NAME="toc1.10">1.10</A> <A HREF="FAQ-1.html#ss1.10">I can't figure out how to unsubscribe from your mailing list.</A>
<LI><A NAME="toc1.11">1.11</A> <A HREF="FAQ-1.html#ss1.11">What other Squid-related documentation is available?</A>
<LI><A NAME="toc1.12">1.12</A> <A HREF="FAQ-1.html#ss1.12">Does Squid support SSL/HTTPS/TLS?</A>
<LI><A NAME="toc1.13">1.13</A> <A HREF="FAQ-1.html#ss1.13">What's the legal status of Squid?</A>
<LI><A NAME="toc1.14">1.14</A> <A HREF="FAQ-1.html#ss1.14">Is Squid year-2000 compliant?</A>
<LI><A NAME="toc1.15">1.15</A> <A HREF="FAQ-1.html#ss1.15">Can I pay someone for Squid support?</A>
<LI><A NAME="toc1.16">1.16</A> <A HREF="FAQ-1.html#ss1.16">Squid FAQ contributors</A>
<LI><A NAME="toc1.17">1.17</A> <A HREF="FAQ-1.html#ss1.17">About This Document</A>
</UL>
<P>
<H2><A NAME="toc2">2.</A> <A HREF="FAQ-2.html">Getting and Compiling Squid</A></H2>

<UL>
<LI><A NAME="toc2.1">2.1</A> <A HREF="FAQ-2.html#ss2.1">Which file do I download to get Squid?</A>
<LI><A NAME="toc2.2">2.2</A> <A HREF="FAQ-2.html#ss2.2">How do I compile Squid?</A>
<LI><A NAME="toc2.3">2.3</A> <A HREF="FAQ-2.html#ss2.3">What kind of compiler do I need?</A>
<LI><A NAME="toc2.4">2.4</A> <A HREF="FAQ-2.html#ss2.4">What else do I need to compile Squid?</A>
<LI><A NAME="toc2.5">2.5</A> <A HREF="FAQ-2.html#ss2.5">Do you have pre-compiled binaries available?</A>
<LI><A NAME="toc2.6">2.6</A> <A HREF="FAQ-2.html#ss2.6">How do I apply a patch or a diff?</A>
<LI><A NAME="toc2.7">2.7</A> <A HREF="FAQ-2.html#ss2.7"><EM>configure</EM> options</A>
<LI><A NAME="toc2.8">2.8</A> <A HREF="FAQ-2.html#ss2.8">undefined reference to __inet_ntoa</A>
<LI><A NAME="toc2.9">2.9</A> <A HREF="FAQ-2.html#ss2.9">How can I get true DNS TTL info into Squid's IP cache?</A>
<LI><A NAME="toc2.10">2.10</A> <A HREF="FAQ-2.html#ss2.10">My platform is BSD/OS or BSDI and I can't compile Squid</A>
<LI><A NAME="toc2.11">2.11</A> <A HREF="FAQ-2.html#ss2.11">Problems compiling <EM>libmiscutil.a</EM> on Solaris</A>
<LI><A NAME="toc2.12">2.12</A> <A HREF="FAQ-2.html#ss2.12">I have problems compiling Squid on Platform Foo.</A>
<LI><A NAME="toc2.13">2.13</A> <A HREF="FAQ-2.html#ss2.13">I see a lot warnings while compiling Squid.</A>
<LI><A NAME="toc2.14">2.14</A> <A HREF="FAQ-2.html#ss2.14">Building Squid on OS/2</A>
<LI><A NAME="toc2.15">2.15</A> <A HREF="FAQ-2.html#ss2.15">Building Squid on Cygwin</A>
</UL>
<P>
<H2><A NAME="toc3">3.</A> <A HREF="FAQ-3.html">Installing and Running Squid</A></H2>

<UL>
<LI><A NAME="toc3.1">3.1</A> <A HREF="FAQ-3.html#ss3.1">How big of a system do I need to run Squid?</A>
<LI><A NAME="toc3.2">3.2</A> <A HREF="FAQ-3.html#ss3.2">How do I install Squid?</A>
<LI><A NAME="toc3.3">3.3</A> <A HREF="FAQ-3.html#ss3.3">What does the <EM>squid.conf</EM> file do?</A>
<LI><A NAME="toc3.4">3.4</A> <A HREF="FAQ-3.html#ss3.4">Do you have a <EM>squid.conf</EM> example?</A>
<LI><A NAME="toc3.5">3.5</A> <A HREF="FAQ-3.html#ss3.5">How do I start Squid?</A>
<LI><A NAME="toc3.6">3.6</A> <A HREF="FAQ-3.html#ss3.6">How do I start Squid automatically when the system boots?</A>
<LI><A NAME="toc3.7">3.7</A> <A HREF="FAQ-3.html#ss3.7">How do I tell if Squid is running?</A>
<LI><A NAME="toc3.8">3.8</A> <A HREF="FAQ-3.html#ss3.8"><EM>squid</EM> command line options</A>
<LI><A NAME="toc3.9">3.9</A> <A HREF="FAQ-3.html#ss3.9">How do I see how Squid works?</A>
<LI><A NAME="toc3.10">3.10</A> <A HREF="FAQ-3.html#ss3.10">Can Squid benefit from SMP systems?</A>
<LI><A NAME="toc3.11">3.11</A> <A HREF="FAQ-3.html#ss3.11">Is it okay to use separate drives and RAID on Squid?</A>
</UL>
<P>
<H2><A NAME="toc4">4.</A> <A HREF="FAQ-4.html">Configuration issues</A></H2>

<UL>
<LI><A NAME="toc4.1">4.1</A> <A HREF="FAQ-4.html#ss4.1">How do I join a cache hierarchy?</A>
<LI><A NAME="toc4.2">4.2</A> <A HREF="FAQ-4.html#ss4.2">How do I join NLANR's cache hierarchy?</A>
<LI><A NAME="toc4.3">4.3</A> <A HREF="FAQ-4.html#ss4.3">Why should I want to join NLANR's cache hierarchy?</A>
<LI><A NAME="toc4.4">4.4</A> <A HREF="FAQ-4.html#ss4.4">How do I register my cache with NLANR's registration service?</A>
<LI><A NAME="toc4.5">4.5</A> <A HREF="FAQ-4.html#ss4.5">How do I find other caches close to me and arrange parent/child/sibling relationships with them?</A>
<LI><A NAME="toc4.6">4.6</A> <A HREF="FAQ-4.html#ss4.6">My cache registration is not appearing in the Tracker database.</A>
<LI><A NAME="toc4.7">4.7</A> <A HREF="FAQ-4.html#ss4.7">What is the httpd-accelerator mode?</A>
<LI><A NAME="toc4.8">4.8</A> <A HREF="FAQ-4.html#ss4.8">How do I configure Squid to work behind a firewall?</A>
<LI><A NAME="toc4.9">4.9</A> <A HREF="FAQ-4.html#ss4.9">How do I configure Squid forward all requests to another proxy?</A>
<LI><A NAME="toc4.10">4.10</A> <A HREF="FAQ-4.html#ss4.10">I have <EM>dnsserver</EM> processes that aren't being used, should I lower the number in <EM>squid.conf</EM>?</A>
<LI><A NAME="toc4.11">4.11</A> <A HREF="FAQ-4.html#ss4.11">My <EM>dnsserver</EM> average/median service time seems high, how can I reduce it?</A>
<LI><A NAME="toc4.12">4.12</A> <A HREF="FAQ-4.html#ss4.12">How can I easily change the default HTTP port?</A>
<LI><A NAME="toc4.13">4.13</A> <A HREF="FAQ-4.html#ss4.13">Is it possible to control how big each <EM>cache_dir</EM> is?</A>
<LI><A NAME="toc4.14">4.14</A> <A HREF="FAQ-4.html#ss4.14">What <EM>cache_dir</EM> size should I use?</A>
<LI><A NAME="toc4.15">4.15</A> <A HREF="FAQ-4.html#ss4.15">I'm adding a new <EM>cache_dir</EM>.  Will I lose my cache?</A>
<LI><A NAME="toc4.16">4.16</A> <A HREF="FAQ-4.html#ss4.16">Squid and <EM>http-gw</EM> from the TIS toolkit.</A>
<LI><A NAME="toc4.17">4.17</A> <A HREF="FAQ-4.html#ss4.17">What is ``HTTP_X_FORWARDED_FOR''?  Why does squid provide it to WWW servers, and how can I stop it?</A>
<LI><A NAME="toc4.18">4.18</A> <A HREF="FAQ-4.html#ss4.18">Can Squid anonymize HTTP requests?</A>
<LI><A NAME="toc4.19">4.19</A> <A HREF="FAQ-4.html#ss4.19">Can I make Squid go direct for some sites?</A>
<LI><A NAME="toc4.20">4.20</A> <A HREF="FAQ-4.html#ss4.20">Can I make Squid proxy only, without caching anything?</A>
<LI><A NAME="toc4.21">4.21</A> <A HREF="FAQ-4.html#ss4.21">Can I prevent users from downloading large files?</A>
</UL>
<P>
<H2><A NAME="toc5">5.</A> <A HREF="FAQ-5.html">Communication between browsers and Squid</A></H2>

<UL>
<LI><A NAME="toc5.1">5.1</A> <A HREF="FAQ-5.html#ss5.1">Netscape manual configuration</A>
<LI><A NAME="toc5.2">5.2</A> <A HREF="FAQ-5.html#ss5.2">Netscape automatic configuration</A>
<LI><A NAME="toc5.3">5.3</A> <A HREF="FAQ-5.html#ss5.3">Lynx and Mosaic configuration</A>
<LI><A NAME="toc5.4">5.4</A> <A HREF="FAQ-5.html#ss5.4">Redundant Proxy Auto-Configuration</A>
<LI><A NAME="toc5.5">5.5</A> <A HREF="FAQ-5.html#ss5.5">Proxy Auto-Configuration with URL Hashing</A>
<LI><A NAME="toc5.6">5.6</A> <A HREF="FAQ-5.html#ss5.6">Microsoft Internet Explorer configuration</A>
<LI><A NAME="toc5.7">5.7</A> <A HREF="FAQ-5.html#ss5.7">Netmanage Internet Chameleon WebSurfer configuration</A>
<LI><A NAME="toc5.8">5.8</A> <A HREF="FAQ-5.html#ss5.8">Opera 2.12 proxy configuration</A>
<LI><A NAME="toc5.9">5.9</A> <A HREF="FAQ-5.html#ss5.9">How do I tell Squid to use a specific username for FTP urls?</A>
<LI><A NAME="toc5.10">5.10</A> <A HREF="FAQ-5.html#ss5.10">Configuring Browsers for WPAD</A>
<LI><A NAME="toc5.11">5.11</A> <A HREF="FAQ-5.html#ss5.11">Configuring Browsers for WPAD with DHCP</A>
<LI><A NAME="toc5.12">5.12</A> <A HREF="FAQ-5.html#ss5.12">IE 5.0x crops trailing slashes from FTP URL's</A>
<LI><A NAME="toc5.13">5.13</A> <A HREF="FAQ-5.html#ss5.13">IE 6.0 SP1 fails when using authentication</A>
</UL>
<P>
<H2><A NAME="toc6">6.</A> <A HREF="FAQ-6.html">Squid Log Files</A></H2>

<UL>
<LI><A NAME="toc6.1">6.1</A> <A HREF="FAQ-6.html#ss6.1"><EM>squid.out</EM></A>
<LI><A NAME="toc6.2">6.2</A> <A HREF="FAQ-6.html#ss6.2"><EM>cache.log</EM></A>
<LI><A NAME="toc6.3">6.3</A> <A HREF="FAQ-6.html#ss6.3"><EM>useragent.log</EM></A>
<LI><A NAME="toc6.4">6.4</A> <A HREF="FAQ-6.html#ss6.4"><EM>store.log</EM></A>
<LI><A NAME="toc6.5">6.5</A> <A HREF="FAQ-6.html#ss6.5"><EM>hierarchy.log</EM></A>
<LI><A NAME="toc6.6">6.6</A> <A HREF="FAQ-6.html#ss6.6"><EM>access.log</EM></A>
<LI><A NAME="toc6.7">6.7</A> <A HREF="FAQ-6.html#ss6.7">Squid result codes</A>
<LI><A NAME="toc6.8">6.8</A> <A HREF="FAQ-6.html#ss6.8">HTTP status codes</A>
<LI><A NAME="toc6.9">6.9</A> <A HREF="FAQ-6.html#ss6.9">Request methods</A>
<LI><A NAME="toc6.10">6.10</A> <A HREF="FAQ-6.html#ss6.10">Hierarchy Codes</A>
<LI><A NAME="toc6.11">6.11</A> <A HREF="FAQ-6.html#ss6.11"><EM>cache/log</EM> (Squid-1.x)</A>
<LI><A NAME="toc6.12">6.12</A> <A HREF="FAQ-6.html#ss6.12"><EM>swap.state</EM> (Squid-2.x)</A>
<LI><A NAME="toc6.13">6.13</A> <A HREF="FAQ-6.html#ss6.13">Which log files can I delete safely?</A>
<LI><A NAME="toc6.14">6.14</A> <A HREF="FAQ-6.html#ss6.14">How can I disable Squid's log files?</A>
<LI><A NAME="toc6.15">6.15</A> <A HREF="FAQ-6.html#ss6.15">My log files get very big!</A>
<LI><A NAME="toc6.16">6.16</A> <A HREF="FAQ-6.html#ss6.16">I want to use another tool to maintain the log files.</A>
<LI><A NAME="toc6.17">6.17</A> <A HREF="FAQ-6.html#ss6.17">Managing log files</A>
<LI><A NAME="toc6.18">6.18</A> <A HREF="FAQ-6.html#ss6.18">Why do I get ERR_NO_CLIENTS_BIG_OBJ messages so often?</A>
<LI><A NAME="toc6.19">6.19</A> <A HREF="FAQ-6.html#ss6.19">What does ERR_LIFETIME_EXP mean?</A>
<LI><A NAME="toc6.20">6.20</A> <A HREF="FAQ-6.html#ss6.20">Retrieving ``lost'' files from the cache</A>
<LI><A NAME="toc6.21">6.21</A> <A HREF="FAQ-6.html#ss6.21">Can I use <EM>store.log</EM> to figure out if a response was cachable?</A>
</UL>
<P>
<H2><A NAME="toc7">7.</A> <A HREF="FAQ-7.html">Operational issues</A></H2>

<UL>
<LI><A NAME="toc7.1">7.1</A> <A HREF="FAQ-7.html#ss7.1">How do I see system level Squid statistics?</A>
<LI><A NAME="toc7.2">7.2</A> <A HREF="FAQ-7.html#ss7.2">How can I find the biggest objects in my cache?</A>
<LI><A NAME="toc7.3">7.3</A> <A HREF="FAQ-7.html#ss7.3">I want to restart Squid with a clean cache</A>
<LI><A NAME="toc7.4">7.4</A> <A HREF="FAQ-7.html#ss7.4">How can I proxy/cache Real Audio?</A>
<LI><A NAME="toc7.5">7.5</A> <A HREF="FAQ-7.html#ss7.5">How can I purge an object from my cache?</A>
<LI><A NAME="toc7.6">7.6</A> <A HREF="FAQ-7.html#ss7.6">Using ICMP to Measure the Network</A>
<LI><A NAME="toc7.7">7.7</A> <A HREF="FAQ-7.html#ss7.7">Why are so few requests logged as TCP_IMS_MISS?</A>
<LI><A NAME="toc7.8">7.8</A> <A HREF="FAQ-7.html#ss7.8">How can I make Squid NOT cache some servers or URLs?</A>
<LI><A NAME="toc7.9">7.9</A> <A HREF="FAQ-7.html#ss7.9">How can I delete and recreate a cache directory?</A>
<LI><A NAME="toc7.10">7.10</A> <A HREF="FAQ-7.html#ss7.10">Why can't I run Squid as root?</A>
<LI><A NAME="toc7.11">7.11</A> <A HREF="FAQ-7.html#ss7.11">Can you tell me a good way to upgrade Squid with minimal downtime?</A>
<LI><A NAME="toc7.12">7.12</A> <A HREF="FAQ-7.html#ss7.12">Can Squid listen on more than one HTTP port?</A>
<LI><A NAME="toc7.13">7.13</A> <A HREF="FAQ-7.html#ss7.13">Can I make origin servers see the client's IP address when going through Squid?</A>
</UL>
<P>
<H2><A NAME="toc8">8.</A> <A HREF="FAQ-8.html">Memory</A></H2>

<UL>
<LI><A NAME="toc8.1">8.1</A> <A HREF="FAQ-8.html#ss8.1">Why does Squid use so much memory!?</A>
<LI><A NAME="toc8.2">8.2</A> <A HREF="FAQ-8.html#ss8.2">How can I tell how much memory my Squid process is using?</A>
<LI><A NAME="toc8.3">8.3</A> <A HREF="FAQ-8.html#ss8.3">My Squid process grows without bounds.</A>
<LI><A NAME="toc8.4">8.4</A> <A HREF="FAQ-8.html#ss8.4">I set <EM>cache_mem</EM> to XX, but the process grows beyond that!</A>
<LI><A NAME="toc8.5">8.5</A> <A HREF="FAQ-8.html#ss8.5">How do I analyze memory usage from the cache manger output?</A>
<LI><A NAME="toc8.6">8.6</A> <A HREF="FAQ-8.html#ss8.6">The ``Total memory accounted'' value is less than the size of my Squid process.</A>
<LI><A NAME="toc8.7">8.7</A> <A HREF="FAQ-8.html#ss8.7">xmalloc: Unable to allocate 4096 bytes!</A>
<LI><A NAME="toc8.8">8.8</A> <A HREF="FAQ-8.html#ss8.8">fork: (12) Cannot allocate memory</A>
<LI><A NAME="toc8.9">8.9</A> <A HREF="FAQ-8.html#ss8.9">What can I do to reduce Squid's memory usage?</A>
<LI><A NAME="toc8.10">8.10</A> <A HREF="FAQ-8.html#ss8.10">Using an alternate <EM>malloc</EM> library.</A>
<LI><A NAME="toc8.11">8.11</A> <A HREF="FAQ-8.html#ss8.11">How much memory do I need in my Squid server?</A>
</UL>
<P>
<H2><A NAME="toc9">9.</A> <A HREF="FAQ-9.html">The Cache Manager</A></H2>

<UL>
<LI><A NAME="toc9.1">9.1</A> <A HREF="FAQ-9.html#ss9.1">What is the cache manager?</A>
<LI><A NAME="toc9.2">9.2</A> <A HREF="FAQ-9.html#ss9.2">How do you set it up?</A>
<LI><A NAME="toc9.3">9.3</A> <A HREF="FAQ-9.html#ss9.3">Cache manager configuration for CERN httpd 3.0</A>
<LI><A NAME="toc9.4">9.4</A> <A HREF="FAQ-9.html#ss9.4">Cache manager configuration for Apache</A>
<LI><A NAME="toc9.5">9.5</A> <A HREF="FAQ-9.html#ss9.5">Cache manager configuration for Roxen 2.0 and later</A>
<LI><A NAME="toc9.6">9.6</A> <A HREF="FAQ-9.html#ss9.6">Cache manager ACLs in <EM>squid.conf</EM></A>
<LI><A NAME="toc9.7">9.7</A> <A HREF="FAQ-9.html#ss9.7">Why does it say I need a password and a URL?</A>
<LI><A NAME="toc9.8">9.8</A> <A HREF="FAQ-9.html#ss9.8">I want to shutdown the cache remotely. What's the password?</A>
<LI><A NAME="toc9.9">9.9</A> <A HREF="FAQ-9.html#ss9.9">How do I make the cache host default to <EM>my</EM> cache?</A>
<LI><A NAME="toc9.10">9.10</A> <A HREF="FAQ-9.html#ss9.10">What's the difference between Squid TCP connections and Squid UDP connections?</A>
<LI><A NAME="toc9.11">9.11</A> <A HREF="FAQ-9.html#ss9.11">It says the storage expiration will happen in 1970!</A>
<LI><A NAME="toc9.12">9.12</A> <A HREF="FAQ-9.html#ss9.12">What do the Meta Data entries mean?</A>
<LI><A NAME="toc9.13">9.13</A> <A HREF="FAQ-9.html#ss9.13">In the utilization section, what is <CODE>Other</CODE>?</A>
<LI><A NAME="toc9.14">9.14</A> <A HREF="FAQ-9.html#ss9.14">In the utilization section, why is the <CODE>Transfer KB/sec</CODE></A>
<LI><A NAME="toc9.15">9.15</A> <A HREF="FAQ-9.html#ss9.15">In the utilization section, what is the <CODE>Object Count</CODE>?</A>
<LI><A NAME="toc9.16">9.16</A> <A HREF="FAQ-9.html#ss9.16">In the utilization section, what is the <CODE>Max/Current/Min KB</CODE>?</A>
<LI><A NAME="toc9.17">9.17</A> <A HREF="FAQ-9.html#ss9.17">What is the <CODE>I/O</CODE> section about?</A>
<LI><A NAME="toc9.18">9.18</A> <A HREF="FAQ-9.html#ss9.18">What is the <CODE>Objects</CODE> section for?</A>
<LI><A NAME="toc9.19">9.19</A> <A HREF="FAQ-9.html#ss9.19">What is the <CODE>VM Objects</CODE> section for?</A>
<LI><A NAME="toc9.20">9.20</A> <A HREF="FAQ-9.html#ss9.20">What does <CODE>AVG RTT</CODE> mean?</A>
<LI><A NAME="toc9.21">9.21</A> <A HREF="FAQ-9.html#ss9.21">In the IP cache section, what's the difference between a hit, a negative hit and a miss?</A>
<LI><A NAME="toc9.22">9.22</A> <A HREF="FAQ-9.html#ss9.22">What do the IP cache contents mean anyway?</A>
<LI><A NAME="toc9.23">9.23</A> <A HREF="FAQ-9.html#ss9.23">What is the fqdncache and how is it different from the ipcache?</A>
<LI><A NAME="toc9.24">9.24</A> <A HREF="FAQ-9.html#ss9.24">What does ``Page faults with physical i/o: 4897'' mean?</A>
<LI><A NAME="toc9.25">9.25</A> <A HREF="FAQ-9.html#ss9.25">What does the IGNORED field mean in the 'cache server list'?</A>
</UL>
<P>
<H2><A NAME="toc10">10.</A> <A HREF="FAQ-10.html">Access Controls</A></H2>

<UL>
<LI><A NAME="toc10.1">10.1</A> <A HREF="FAQ-10.html#ss10.1">Introduction</A>
<LI><A NAME="toc10.2">10.2</A> <A HREF="FAQ-10.html#ss10.2">How do I allow my clients to use the cache?</A>
<LI><A NAME="toc10.3">10.3</A> <A HREF="FAQ-10.html#ss10.3">how do I configure Squid not to cache a specific server? </A>
<LI><A NAME="toc10.4">10.4</A> <A HREF="FAQ-10.html#ss10.4">How do I implement an ACL ban list?</A>
<LI><A NAME="toc10.5">10.5</A> <A HREF="FAQ-10.html#ss10.5">How do I block specific users or groups from accessing my cache?</A>
<LI><A NAME="toc10.6">10.6</A> <A HREF="FAQ-10.html#ss10.6">Do you have a CGI program which lets users change their own proxy passwords?</A>
<LI><A NAME="toc10.7">10.7</A> <A HREF="FAQ-10.html#ss10.7">Is there a way to do ident lookups only for a certain host and compare the result with a userlist in squid.conf?</A>
<LI><A NAME="toc10.8">10.8</A> <A HREF="FAQ-10.html#ss10.8">Common Mistakes</A>
<LI><A NAME="toc10.9">10.9</A> <A HREF="FAQ-10.html#ss10.9">I set up my access controls, but they don't work!  why?</A>
<LI><A NAME="toc10.10">10.10</A> <A HREF="FAQ-10.html#ss10.10">Proxy-authentication and neighbor caches</A>
<LI><A NAME="toc10.11">10.11</A> <A HREF="FAQ-10.html#ss10.11">Is there an easy way of banning all Destination addresses except one?</A>
<LI><A NAME="toc10.12">10.12</A> <A HREF="FAQ-10.html#ss10.12">Does anyone have a ban list of porn sites and such?</A>
<LI><A NAME="toc10.13">10.13</A> <A HREF="FAQ-10.html#ss10.13">Squid doesn't match my subdomains</A>
<LI><A NAME="toc10.14">10.14</A> <A HREF="FAQ-10.html#ss10.14">Why does Squid deny some port numbers?</A>
<LI><A NAME="toc10.15">10.15</A> <A HREF="FAQ-10.html#ss10.15">Does Squid support the use of a database such as mySQL for storing the ACL list?</A>
<LI><A NAME="toc10.16">10.16</A> <A HREF="FAQ-10.html#ss10.16">How can I allow a single address to access a specific URL?</A>
<LI><A NAME="toc10.17">10.17</A> <A HREF="FAQ-10.html#ss10.17">How can I allow some clients to use the cache at specific times?</A>
<LI><A NAME="toc10.18">10.18</A> <A HREF="FAQ-10.html#ss10.18">How can I allow some users to use the cache at specific times?</A>
<LI><A NAME="toc10.19">10.19</A> <A HREF="FAQ-10.html#ss10.19">Problems with IP ACL's that have complicated netmasks</A>
<LI><A NAME="toc10.20">10.20</A> <A HREF="FAQ-10.html#ss10.20">Can I set up ACL's based on MAC address rather than IP?</A>
<LI><A NAME="toc10.21">10.21</A> <A HREF="FAQ-10.html#ss10.21">Debugging ACLs</A>
<LI><A NAME="toc10.22">10.22</A> <A HREF="FAQ-10.html#ss10.22">Can I limit the number of connections from a client?</A>
<LI><A NAME="toc10.23">10.23</A> <A HREF="FAQ-10.html#ss10.23">I'm trying to deny <EM>foo.com</EM>, but it's not working.</A>
<LI><A NAME="toc10.24">10.24</A> <A HREF="FAQ-10.html#ss10.24">I want to customize, or make my own error messages.</A>
<LI><A NAME="toc10.25">10.25</A> <A HREF="FAQ-10.html#ss10.25">I want to use local time zone in error messages.</A>
<LI><A NAME="toc10.26">10.26</A> <A HREF="FAQ-10.html#ss10.26">I want to put ACL parameters in an external file.</A>
</UL>
<P>
<H2><A NAME="toc11">11.</A> <A HREF="FAQ-11.html">Troubleshooting</A></H2>

<UL>
<LI><A NAME="toc11.1">11.1</A> <A HREF="FAQ-11.html#ss11.1">Why am I getting ``Proxy Access Denied?''</A>
<LI><A NAME="toc11.2">11.2</A> <A HREF="FAQ-11.html#ss11.2">I can't get <CODE>local_domain</CODE> to work; <EM>Squid</EM> is caching the objects from my local servers.</A>
<LI><A NAME="toc11.3">11.3</A> <A HREF="FAQ-11.html#ss11.3">I get <CODE>Connection Refused</CODE> when the cache tries to retrieve an object located on a sibling, even though the sibling thinks it delivered the object to my cache.</A>
<LI><A NAME="toc11.4">11.4</A> <A HREF="FAQ-11.html#ss11.4">Running out of filedescriptors</A>
<LI><A NAME="toc11.5">11.5</A> <A HREF="FAQ-11.html#ss11.5">What are these strange lines about removing objects?</A>
<LI><A NAME="toc11.6">11.6</A> <A HREF="FAQ-11.html#ss11.6">Can I change a Windows NT FTP server to list directories in Unix format?</A>
<LI><A NAME="toc11.7">11.7</A> <A HREF="FAQ-11.html#ss11.7">Why am I getting ``Ignoring MISS from non-peer x.x.x.x?''</A>
<LI><A NAME="toc11.8">11.8</A> <A HREF="FAQ-11.html#ss11.8">DNS lookups for domain names with underscores (_) always fail.</A>
<LI><A NAME="toc11.9">11.9</A> <A HREF="FAQ-11.html#ss11.9">Why does Squid say: ``Illegal character in hostname; underscores are not allowed?'</A>
<LI><A NAME="toc11.10">11.10</A> <A HREF="FAQ-11.html#ss11.10">Why am I getting access denied from a sibling cache?</A>
<LI><A NAME="toc11.11">11.11</A> <A HREF="FAQ-11.html#ss11.11">Cannot bind socket FD NN to *:8080 (125) Address already in use</A>
<LI><A NAME="toc11.12">11.12</A> <A HREF="FAQ-11.html#ss11.12">icpDetectClientClose: ERROR xxx.xxx.xxx.xxx: (32) Broken pipe</A>
<LI><A NAME="toc11.13">11.13</A> <A HREF="FAQ-11.html#ss11.13">icpDetectClientClose: FD 135, 255 unexpected bytes</A>
<LI><A NAME="toc11.14">11.14</A> <A HREF="FAQ-11.html#ss11.14">Does Squid work with NTLM Authentication?</A>
<LI><A NAME="toc11.15">11.15</A> <A HREF="FAQ-11.html#ss11.15">The <EM>default</EM> parent option isn't working!</A>
<LI><A NAME="toc11.16">11.16</A> <A HREF="FAQ-11.html#ss11.16">``Hot Mail'' complains about: Intrusion Logged. Access denied.</A>
<LI><A NAME="toc11.17">11.17</A> <A HREF="FAQ-11.html#ss11.17">My Squid becomes very slow after it has been running for some time.</A>
<LI><A NAME="toc11.18">11.18</A> <A HREF="FAQ-11.html#ss11.18">WARNING: Failed to start 'dnsserver'</A>
<LI><A NAME="toc11.19">11.19</A> <A HREF="FAQ-11.html#ss11.19">Sending in Squid bug reports</A>
<LI><A NAME="toc11.20">11.20</A> <A HREF="FAQ-11.html#ss11.20">Debugging Squid</A>
<LI><A NAME="toc11.21">11.21</A> <A HREF="FAQ-11.html#ss11.21">FATAL: ipcache_init: DNS name lookup tests failed</A>
<LI><A NAME="toc11.22">11.22</A> <A HREF="FAQ-11.html#ss11.22">FATAL: Failed to make swap directory /var/spool/cache: (13) Permission denied</A>
<LI><A NAME="toc11.23">11.23</A> <A HREF="FAQ-11.html#ss11.23">FATAL: Cannot open HTTP Port</A>
<LI><A NAME="toc11.24">11.24</A> <A HREF="FAQ-11.html#ss11.24">FATAL: All redirectors have exited!</A>
<LI><A NAME="toc11.25">11.25</A> <A HREF="FAQ-11.html#ss11.25">FATAL: file_map_allocate: Exceeded filemap limit</A>
<LI><A NAME="toc11.26">11.26</A> <A HREF="FAQ-11.html#ss11.26">FATAL: You've run out of swap file numbers.</A>
<LI><A NAME="toc11.27">11.27</A> <A HREF="FAQ-11.html#ss11.27">I am using up over 95% of the filemap bits?!!</A>
<LI><A NAME="toc11.28">11.28</A> <A HREF="FAQ-11.html#ss11.28">FATAL: Cannot open /usr/local/squid/logs/access.log: (13) Permission denied</A>
<LI><A NAME="toc11.29">11.29</A> <A HREF="FAQ-11.html#ss11.29">When using a username and password, I can not access some files.</A>
<LI><A NAME="toc11.30">11.30</A> <A HREF="FAQ-11.html#ss11.30">pingerOpen: icmp_sock: (13) Permission denied</A>
<LI><A NAME="toc11.31">11.31</A> <A HREF="FAQ-11.html#ss11.31">What is a forwarding loop?</A>
<LI><A NAME="toc11.32">11.32</A> <A HREF="FAQ-11.html#ss11.32">accept failure: (71) Protocol error</A>
<LI><A NAME="toc11.33">11.33</A> <A HREF="FAQ-11.html#ss11.33">storeSwapInFileOpened: ... Size mismatch</A>
<LI><A NAME="toc11.34">11.34</A> <A HREF="FAQ-11.html#ss11.34">Why do I get <EM>fwdDispatch: Cannot retrieve 'https://www.buy.com/corp/ordertracking.asp'</EM></A>
<LI><A NAME="toc11.35">11.35</A> <A HREF="FAQ-11.html#ss11.35">Squid can't access URLs like http://3626046468/ab2/cybercards/moreinfo.html</A>
<LI><A NAME="toc11.36">11.36</A> <A HREF="FAQ-11.html#ss11.36">I get a lot of ``URI has whitespace'' error messages in my cache log, what should I do?</A>
<LI><A NAME="toc11.37">11.37</A> <A HREF="FAQ-11.html#ss11.37">commBind: Cannot bind socket FD 5 to 127.0.0.1:0: (49) Can't assign requested address</A>
<LI><A NAME="toc11.38">11.38</A> <A HREF="FAQ-11.html#ss11.38">Unknown cache_dir type '/var/squid/cache'</A>
<LI><A NAME="toc11.39">11.39</A> <A HREF="FAQ-11.html#ss11.39">unrecognized: 'cache_dns_program /usr/local/squid/bin/dnsserver'</A>
<LI><A NAME="toc11.40">11.40</A> <A HREF="FAQ-11.html#ss11.40">Is <EM>dns_defnames</EM> broken in Squid-2.3 and later</A>
<LI><A NAME="toc11.41">11.41</A> <A HREF="FAQ-11.html#ss11.41">What does <EM>sslReadClient: FD 14: read failure: (104) Connection reset by peer</EM> mean?</A>
<LI><A NAME="toc11.42">11.42</A> <A HREF="FAQ-11.html#ss11.42">What does <EM>Connection refused</EM> mean?</A>
<LI><A NAME="toc11.43">11.43</A> <A HREF="FAQ-11.html#ss11.43">squid: ERROR: no running copy</A>
<LI><A NAME="toc11.44">11.44</A> <A HREF="FAQ-11.html#ss11.44">FATAL: getgrnam failed to find groupid for effective group 'nogroup'</A>
<LI><A NAME="toc11.45">11.45</A> <A HREF="FAQ-11.html#ss11.45">``Unsupported Request Method and Protocol'' for <EM>https</EM> URLs.</A>
<LI><A NAME="toc11.46">11.46</A> <A HREF="FAQ-11.html#ss11.46">Squid uses 100% CPU</A>
<LI><A NAME="toc11.47">11.47</A> <A HREF="FAQ-11.html#ss11.47">Webmin's <EM>cachemgr.cgi</EM> crashes the operating system</A>
<LI><A NAME="toc11.48">11.48</A> <A HREF="FAQ-11.html#ss11.48">Segment Violation at startup or upon first request</A>
<LI><A NAME="toc11.49">11.49</A> <A HREF="FAQ-11.html#ss11.49">urlParse: Illegal character in hostname 'proxy.mydomain.com:8080proxy.mydomain.com'</A>
<LI><A NAME="toc11.50">11.50</A> <A HREF="FAQ-11.html#ss11.50">Requests for international domain names does not work</A>
<LI><A NAME="toc11.51">11.51</A> <A HREF="FAQ-11.html#ss11.51">Why do I sometimes get ``Zero Sized Reply''?</A>
<LI><A NAME="toc11.52">11.52</A> <A HREF="FAQ-11.html#ss11.52">Why do I get "The request or reply is too large" errors?</A>
<LI><A NAME="toc11.53">11.53</A> <A HREF="FAQ-11.html#ss11.53">Negative or very large numbers in Store Directory Statistics, or constant complaints about cache above limit</A>
<LI><A NAME="toc11.54">11.54</A> <A HREF="FAQ-11.html#ss11.54">Squid problems with WindowsUpdate v5</A>
</UL>
<P>
<H2><A NAME="toc12">12.</A> <A HREF="FAQ-12.html">How does Squid work?</A></H2>

<UL>
<LI><A NAME="toc12.1">12.1</A> <A HREF="FAQ-12.html#ss12.1">What are cachable objects?</A>
<LI><A NAME="toc12.2">12.2</A> <A HREF="FAQ-12.html#ss12.2">What is the ICP protocol?</A>
<LI><A NAME="toc12.3">12.3</A> <A HREF="FAQ-12.html#ss12.3">What is the <EM>dnsserver</EM>?</A>
<LI><A NAME="toc12.4">12.4</A> <A HREF="FAQ-12.html#ss12.4">What is the <EM>ftpget</EM> program for?</A>
<LI><A NAME="toc12.5">12.5</A> <A HREF="FAQ-12.html#ss12.5">FTP PUT's don't work!</A>
<LI><A NAME="toc12.6">12.6</A> <A HREF="FAQ-12.html#ss12.6">What is a cache hierarchy?  What are parents and siblings?</A>
<LI><A NAME="toc12.7">12.7</A> <A HREF="FAQ-12.html#ss12.7">What is the Squid cache resolution algorithm?</A>
<LI><A NAME="toc12.8">12.8</A> <A HREF="FAQ-12.html#ss12.8">What features are Squid developers currently working on?</A>
<LI><A NAME="toc12.9">12.9</A> <A HREF="FAQ-12.html#ss12.9">Tell me more about Internet traffic workloads</A>
<LI><A NAME="toc12.10">12.10</A> <A HREF="FAQ-12.html#ss12.10">What are the tradeoffs of caching with the NLANR cache system?</A>
<LI><A NAME="toc12.11">12.11</A> <A HREF="FAQ-12.html#ss12.11">Where can I find out more about firewalls?</A>
<LI><A NAME="toc12.12">12.12</A> <A HREF="FAQ-12.html#ss12.12">What is the ``Storage LRU Expiration Age?''</A>
<LI><A NAME="toc12.13">12.13</A> <A HREF="FAQ-12.html#ss12.13">What is ``Failure Ratio at 1.01; Going into hit-only-mode for 5 minutes''?</A>
<LI><A NAME="toc12.14">12.14</A> <A HREF="FAQ-12.html#ss12.14">Does squid periodically re-read its configuration file?</A>
<LI><A NAME="toc12.15">12.15</A> <A HREF="FAQ-12.html#ss12.15">How does <EM>unlinkd</EM> work?</A>
<LI><A NAME="toc12.16">12.16</A> <A HREF="FAQ-12.html#ss12.16">What is an icon URL?</A>
<LI><A NAME="toc12.17">12.17</A> <A HREF="FAQ-12.html#ss12.17">Can I make my regular FTP clients use a Squid cache?</A>
<LI><A NAME="toc12.18">12.18</A> <A HREF="FAQ-12.html#ss12.18">Why is the select loop average time so high?</A>
<LI><A NAME="toc12.19">12.19</A> <A HREF="FAQ-12.html#ss12.19">How does Squid deal with Cookies?</A>
<LI><A NAME="toc12.20">12.20</A> <A HREF="FAQ-12.html#ss12.20">How does Squid decide when to refresh a cached object?</A>
<LI><A NAME="toc12.21">12.21</A> <A HREF="FAQ-12.html#ss12.21">What exactly is a <EM>deferred read</EM>?</A>
<LI><A NAME="toc12.22">12.22</A> <A HREF="FAQ-12.html#ss12.22">Why is my cache's inbound traffic equal to the outbound traffic?</A>
<LI><A NAME="toc12.23">12.23</A> <A HREF="FAQ-12.html#ss12.23">How come some objects do not get cached?</A>
<LI><A NAME="toc12.24">12.24</A> <A HREF="FAQ-12.html#ss12.24">What does <EM>keep-alive ratio</EM> mean?</A>
<LI><A NAME="toc12.25">12.25</A> <A HREF="FAQ-12.html#ss12.25">How does Squid's cache replacement algorithm work?</A>
<LI><A NAME="toc12.26">12.26</A> <A HREF="FAQ-12.html#ss12.26">What are private and public keys?</A>
<LI><A NAME="toc12.27">12.27</A> <A HREF="FAQ-12.html#ss12.27">What is FORW_VIA_DB for?</A>
<LI><A NAME="toc12.28">12.28</A> <A HREF="FAQ-12.html#ss12.28">Does Squid send packets to port 7 (echo)?  If so, why?</A>
<LI><A NAME="toc12.29">12.29</A> <A HREF="FAQ-12.html#ss12.29">What does ``WARNING: Reply from unknown nameserver [a.b.c.d]'' mean?</A>
<LI><A NAME="toc12.30">12.30</A> <A HREF="FAQ-12.html#ss12.30">How does Squid distribute cache files among the available directories?</A>
<LI><A NAME="toc12.31">12.31</A> <A HREF="FAQ-12.html#ss12.31">Why do I see negative byte hit ratio?</A>
<LI><A NAME="toc12.32">12.32</A> <A HREF="FAQ-12.html#ss12.32">What does ``Disabling use of private keys'' mean?</A>
<LI><A NAME="toc12.33">12.33</A> <A HREF="FAQ-12.html#ss12.33">What is a half-closed filedescriptor?</A>
<LI><A NAME="toc12.34">12.34</A> <A HREF="FAQ-12.html#ss12.34">What does --enable-heap-replacement do?</A>
<LI><A NAME="toc12.35">12.35</A> <A HREF="FAQ-12.html#ss12.35">Why is actual filesystem space used greater than what Squid thinks?</A>
<LI><A NAME="toc12.36">12.36</A> <A HREF="FAQ-12.html#ss12.36">How do <EM>positive_dns_ttl</EM> and <EM>negative_dns_ttl</EM> work?</A>
<LI><A NAME="toc12.37">12.37</A> <A HREF="FAQ-12.html#ss12.37">What does <EM>swapin MD5 mismatch</EM> mean?</A>
<LI><A NAME="toc12.38">12.38</A> <A HREF="FAQ-12.html#ss12.38">What does <EM>failed to unpack swapfile meta data</EM> mean?</A>
<LI><A NAME="toc12.39">12.39</A> <A HREF="FAQ-12.html#ss12.39">Why doesn't Squid make <EM>ident</EM> lookups in interception mode?</A>
<LI><A NAME="toc12.40">12.40</A> <A HREF="FAQ-12.html#ss12.40">dnsSubmit: queue overload, rejecting blah</A>
<LI><A NAME="toc12.41">12.41</A> <A HREF="FAQ-12.html#ss12.41">What are FTP passive connections?</A>
</UL>
<P>
<H2><A NAME="toc13">13.</A> <A HREF="FAQ-13.html">Multicast</A></H2>

<UL>
<LI><A NAME="toc13.1">13.1</A> <A HREF="FAQ-13.html#ss13.1">What is Multicast?</A>
<LI><A NAME="toc13.2">13.2</A> <A HREF="FAQ-13.html#ss13.2">How do I know if my network has multicast?</A>
<LI><A NAME="toc13.3">13.3</A> <A HREF="FAQ-13.html#ss13.3">Should I be using Multicast ICP?</A>
<LI><A NAME="toc13.4">13.4</A> <A HREF="FAQ-13.html#ss13.4">How do I configure Squid to send Multicast ICP queries?</A>
<LI><A NAME="toc13.5">13.5</A> <A HREF="FAQ-13.html#ss13.5">How do I know what Multicast TTL to use?</A>
<LI><A NAME="toc13.6">13.6</A> <A HREF="FAQ-13.html#ss13.6">How do I configure Squid to receive and respond to Multicast ICP?</A>
</UL>
<P>
<H2><A NAME="toc14">14.</A> <A HREF="FAQ-14.html">System-Dependent Weirdnesses</A></H2>

<UL>
<LI><A NAME="toc14.1">14.1</A> <A HREF="FAQ-14.html#ss14.1">Solaris</A>
<LI><A NAME="toc14.2">14.2</A> <A HREF="FAQ-14.html#ss14.2">FreeBSD</A>
<LI><A NAME="toc14.3">14.3</A> <A HREF="FAQ-14.html#ss14.3">OSF1/3.2</A>
<LI><A NAME="toc14.4">14.4</A> <A HREF="FAQ-14.html#ss14.4">BSD/OS</A>
<LI><A NAME="toc14.5">14.5</A> <A HREF="FAQ-14.html#ss14.5">Linux</A>
<LI><A NAME="toc14.6">14.6</A> <A HREF="FAQ-14.html#ss14.6">HP-UX</A>
<LI><A NAME="toc14.7">14.7</A> <A HREF="FAQ-14.html#ss14.7">IRIX</A>
<LI><A NAME="toc14.8">14.8</A> <A HREF="FAQ-14.html#ss14.8">SCO-UNIX</A>
<LI><A NAME="toc14.9">14.9</A> <A HREF="FAQ-14.html#ss14.9">AIX</A>
</UL>
<P>
<H2><A NAME="toc15">15.</A> <A HREF="FAQ-15.html">Redirectors</A></H2>

<UL>
<LI><A NAME="toc15.1">15.1</A> <A HREF="FAQ-15.html#ss15.1">What is a redirector?</A>
<LI><A NAME="toc15.2">15.2</A> <A HREF="FAQ-15.html#ss15.2">Why use a redirector?</A>
<LI><A NAME="toc15.3">15.3</A> <A HREF="FAQ-15.html#ss15.3">How does it work?</A>
<LI><A NAME="toc15.4">15.4</A> <A HREF="FAQ-15.html#ss15.4">Do you have any examples?</A>
<LI><A NAME="toc15.5">15.5</A> <A HREF="FAQ-15.html#ss15.5">Can I use the redirector to return HTTP redirect messages?</A>
<LI><A NAME="toc15.6">15.6</A> <A HREF="FAQ-15.html#ss15.6">FATAL: All redirectors have exited!</A>
<LI><A NAME="toc15.7">15.7</A> <A HREF="FAQ-15.html#ss15.7">Redirector interface is broken re IDENT values</A>
</UL>
<P>
<H2><A NAME="toc16">16.</A> <A HREF="FAQ-16.html">Cache Digests</A></H2>

<UL>
<LI><A NAME="toc16.1">16.1</A> <A HREF="FAQ-16.html#ss16.1">What is a Cache Digest?</A>
<LI><A NAME="toc16.2">16.2</A> <A HREF="FAQ-16.html#ss16.2">How and why are they used?</A>
<LI><A NAME="toc16.3">16.3</A> <A HREF="FAQ-16.html#ss16.3">What is the theory behind Cache Digests?</A>
<LI><A NAME="toc16.4">16.4</A> <A HREF="FAQ-16.html#ss16.4">How is the size of the Cache Digest in Squid determined?</A>
<LI><A NAME="toc16.5">16.5</A> <A HREF="FAQ-16.html#ss16.5">What hash functions (and how many of them) does Squid use?</A>
<LI><A NAME="toc16.6">16.6</A> <A HREF="FAQ-16.html#ss16.6">How are objects added to the Cache Digest in Squid?</A>
<LI><A NAME="toc16.7">16.7</A> <A HREF="FAQ-16.html#ss16.7">Does Squid support deletions in Cache Digests? What are diffs/deltas?</A>
<LI><A NAME="toc16.8">16.8</A> <A HREF="FAQ-16.html#ss16.8">When and how often is the local digest built?</A>
<LI><A NAME="toc16.9">16.9</A> <A HREF="FAQ-16.html#ss16.9">How are Cache Digests transferred between peers?</A>
<LI><A NAME="toc16.10">16.10</A> <A HREF="FAQ-16.html#ss16.10">How and where are Cache Digests stored?</A>
<LI><A NAME="toc16.11">16.11</A> <A HREF="FAQ-16.html#ss16.11">How are the Cache Digest statistics in the Cache Manager to be interpreted?</A>
<LI><A NAME="toc16.12">16.12</A> <A HREF="FAQ-16.html#ss16.12">What are False Hits and how should they be handled?</A>
<LI><A NAME="toc16.13">16.13</A> <A HREF="FAQ-16.html#ss16.13">How can Cache Digest related activity be traced/debugged?</A>
<LI><A NAME="toc16.14">16.14</A> <A HREF="FAQ-16.html#ss16.14">What about ICP?</A>
<LI><A NAME="toc16.15">16.15</A> <A HREF="FAQ-16.html#ss16.15">Is there a Cache Digest Specification?</A>
<LI><A NAME="toc16.16">16.16</A> <A HREF="FAQ-16.html#ss16.16">Would it be possible to stagger the timings when cache_digests are retrieved from peers?</A>
</UL>
<P>
<H2><A NAME="toc17">17.</A> <A HREF="FAQ-17.html">Interception Caching/Proxying</A></H2>

<UL>
<LI><A NAME="toc17.1">17.1</A> <A HREF="FAQ-17.html#ss17.1">Interception caching for Solaris, SunOS, and BSD systems</A>
<LI><A NAME="toc17.2">17.2</A> <A HREF="FAQ-17.html#ss17.2">Interception caching with Linux 2.0 and ipfwadm</A>
<LI><A NAME="toc17.3">17.3</A> <A HREF="FAQ-17.html#ss17.3">Interception caching with Linux 2.2 and ipchains</A>
<LI><A NAME="toc17.4">17.4</A> <A HREF="FAQ-17.html#ss17.4">Interception caching with Linux 2.4 and netfilter</A>
<LI><A NAME="toc17.5">17.5</A> <A HREF="FAQ-17.html#ss17.5">Interception caching with Cisco routers</A>
<LI><A NAME="toc17.6">17.6</A> <A HREF="FAQ-17.html#ss17.6">Interception caching with LINUX 2.0.29 and CISCO IOS 11.1</A>
<LI><A NAME="toc17.7">17.7</A> <A HREF="FAQ-17.html#ss17.7">Interception caching with FreeBSD</A>
<LI><A NAME="toc17.8">17.8</A> <A HREF="FAQ-17.html#ss17.8">Interception caching with ACC Tigris digital access server</A>
<LI><A NAME="toc17.9">17.9</A> <A HREF="FAQ-17.html#ss17.9">Interception caching with Foundry L4 switches</A>
<LI><A NAME="toc17.10">17.10</A> <A HREF="FAQ-17.html#ss17.10">Interception caching with Cabletron/Entrasys products</A>
<LI><A NAME="toc17.11">17.11</A> <A HREF="FAQ-17.html#ss17.11">The cache is trying to connect to itself...</A>
<LI><A NAME="toc17.12">17.12</A> <A HREF="FAQ-17.html#ss17.12">``Connection reset by peer'' and Cisco policy routing</A>
<LI><A NAME="toc17.13">17.13</A> <A HREF="FAQ-17.html#ss17.13">WCCP - Web Cache Coordination Protocol</A>
<LI><A NAME="toc17.14">17.14</A> <A HREF="FAQ-17.html#ss17.14">Can someone tell me what version of cisco IOS WCCP is added in?</A>
<LI><A NAME="toc17.15">17.15</A> <A HREF="FAQ-17.html#ss17.15">What about WCCPv2?</A>
<LI><A NAME="toc17.16">17.16</A> <A HREF="FAQ-17.html#ss17.16">Can I use <EM>proxy_auth</EM> with interception?</A>
<LI><A NAME="toc17.17">17.17</A> <A HREF="FAQ-17.html#ss17.17">Interception on Linux with Squid and the Browser on the same box</A>
<LI><A NAME="toc17.18">17.18</A> <A HREF="FAQ-17.html#ss17.18">Interception caching with an Alcatel OmnySwitch 7700</A>
</UL>
<P>
<H2><A NAME="toc18">18.</A> <A HREF="FAQ-18.html">SNMP</A></H2>

<UL>
<LI><A NAME="toc18.1">18.1</A> <A HREF="FAQ-18.html#ss18.1">Does Squid support SNMP?</A>
<LI><A NAME="toc18.2">18.2</A> <A HREF="FAQ-18.html#ss18.2">Enabling SNMP in Squid</A>
<LI><A NAME="toc18.3">18.3</A> <A HREF="FAQ-18.html#ss18.3">Configuring Squid 2.2</A>
<LI><A NAME="toc18.4">18.4</A> <A HREF="FAQ-18.html#ss18.4">Configuring Squid 2.1</A>
<LI><A NAME="toc18.5">18.5</A> <A HREF="FAQ-18.html#ss18.5">How can I query the Squid SNMP Agent</A>
<LI><A NAME="toc18.6">18.6</A> <A HREF="FAQ-18.html#ss18.6">What can I use SNMP and Squid for?</A>
<LI><A NAME="toc18.7">18.7</A> <A HREF="FAQ-18.html#ss18.7">How can I use SNMP with Squid?</A>
<LI><A NAME="toc18.8">18.8</A> <A HREF="FAQ-18.html#ss18.8">Where can I get more information/discussion about Squid and SNMP?</A>
<LI><A NAME="toc18.9">18.9</A> <A HREF="FAQ-18.html#ss18.9">Monitoring Squid with MRTG</A>
</UL>
<P>
<H2><A NAME="toc19">19.</A> <A HREF="FAQ-19.html">Squid version 2</A></H2>

<UL>
<LI><A NAME="toc19.1">19.1</A> <A HREF="FAQ-19.html#ss19.1">What are the new features?</A>
<LI><A NAME="toc19.2">19.2</A> <A HREF="FAQ-19.html#ss19.2">How do I configure 'ssl_proxy' now?</A>
<LI><A NAME="toc19.3">19.3</A> <A HREF="FAQ-19.html#ss19.3">Empty placeholder</A>
<LI><A NAME="toc19.4">19.4</A> <A HREF="FAQ-19.html#ss19.4">Adding a new cache disk</A>
<LI><A NAME="toc19.5">19.5</A> <A HREF="FAQ-19.html#ss19.5">Empty placeholder</A>
<LI><A NAME="toc19.6">19.6</A> <A HREF="FAQ-19.html#ss19.6">How do I configure proxy authentication?</A>
<LI><A NAME="toc19.7">19.7</A> <A HREF="FAQ-19.html#ss19.7">Why does proxy-auth reject all users after upgrading from Squid-2.1 or earlier?</A>
<LI><A NAME="toc19.8">19.8</A> <A HREF="FAQ-19.html#ss19.8">Delay Pools</A>
<LI><A NAME="toc19.9">19.9</A> <A HREF="FAQ-19.html#ss19.9">Can I preserve my cache when upgrading from 1.1 to 2?</A>
<LI><A NAME="toc19.10">19.10</A> <A HREF="FAQ-19.html#ss19.10">Customizable Error Messages</A>
<LI><A NAME="toc19.11">19.11</A> <A HREF="FAQ-19.html#ss19.11">My squid.conf from version 1.1 doesn't work!</A>
</UL>
<P>
<H2><A NAME="toc20">20.</A> <A HREF="FAQ-20.html">httpd-accelerator mode</A></H2>

<UL>
<LI><A NAME="toc20.1">20.1</A> <A HREF="FAQ-20.html#ss20.1">What is the httpd-accelerator mode?</A>
<LI><A NAME="toc20.2">20.2</A> <A HREF="FAQ-20.html#ss20.2">How do I set it up?</A>
<LI><A NAME="toc20.3">20.3</A> <A HREF="FAQ-20.html#ss20.3">When using an httpd-accelerator, the port number for redirects is wrong</A>
</UL>
<P>
<H2><A NAME="toc21">21.</A> <A HREF="FAQ-21.html">Related Software</A></H2>

<UL>
<LI><A NAME="toc21.1">21.1</A> <A HREF="FAQ-21.html#ss21.1">Clients</A>
<LI><A NAME="toc21.2">21.2</A> <A HREF="FAQ-21.html#ss21.2">Logfile Analysis</A>
<LI><A NAME="toc21.3">21.3</A> <A HREF="FAQ-21.html#ss21.3">Configuration Tools</A>
<LI><A NAME="toc21.4">21.4</A> <A HREF="FAQ-21.html#ss21.4">Squid add-ons</A>
<LI><A NAME="toc21.5">21.5</A> <A HREF="FAQ-21.html#ss21.5">Ident Servers</A>
</UL>
<P>
<H2><A NAME="toc22">22.</A> <A HREF="FAQ-22.html">DISKD</A></H2>

<UL>
<LI><A NAME="toc22.1">22.1</A> <A HREF="FAQ-22.html#ss22.1">What is DISKD?</A>
<LI><A NAME="toc22.2">22.2</A> <A HREF="FAQ-22.html#ss22.2">Does it perform better?</A>
<LI><A NAME="toc22.3">22.3</A> <A HREF="FAQ-22.html#ss22.3">How do I use it?</A>
<LI><A NAME="toc22.4">22.4</A> <A HREF="FAQ-22.html#ss22.4">FATAL: Unknown cache_dir type 'diskd'</A>
<LI><A NAME="toc22.5">22.5</A> <A HREF="FAQ-22.html#ss22.5">If I use DISKD, do I have to wipe out my current cache?</A>
<LI><A NAME="toc22.6">22.6</A> <A HREF="FAQ-22.html#ss22.6">How do I configure message queues?</A>
<LI><A NAME="toc22.7">22.7</A> <A HREF="FAQ-22.html#ss22.7">How do I configure shared memory?</A>
<LI><A NAME="toc22.8">22.8</A> <A HREF="FAQ-22.html#ss22.8">Sometimes shared memory and message queues aren't released when Squid exits.</A>
<LI><A NAME="toc22.9">22.9</A> <A HREF="FAQ-22.html#ss22.9">What are the Q1 and Q2 parameters?</A>
</UL>
<P>
<H2><A NAME="toc23">23.</A> <A HREF="FAQ-23.html">Authentication</A></H2>

<UL>
<LI><A NAME="toc23.1">23.1</A> <A HREF="FAQ-23.html#ss23.1">How does Proxy Authentication work in Squid?</A>
<LI><A NAME="toc23.2">23.2</A> <A HREF="FAQ-23.html#ss23.2">How do I use authentication in access controls?</A>
<LI><A NAME="toc23.3">23.3</A> <A HREF="FAQ-23.html#ss23.3">Does Squid cache authentication lookups?</A>
<LI><A NAME="toc23.4">23.4</A> <A HREF="FAQ-23.html#ss23.4">Are passwords stored in clear text or encrypted?</A>
<LI><A NAME="toc23.5">23.5</A> <A HREF="FAQ-23.html#ss23.5">How do I use the Winbind authenticators?</A>
<LI><A NAME="toc23.6">23.6</A> <A HREF="FAQ-23.html#ss23.6">Authentication in accelerator mode</A>
</UL>
<P>
<H2><A NAME="toc24">24.</A> <A HREF="FAQ-24.html">Terms and Definitions</A></H2>

<UL>
<LI><A NAME="toc24.1">24.1</A> <A HREF="FAQ-24.html#ss24.1">Neighbor</A>
<LI><A NAME="toc24.2">24.2</A> <A HREF="FAQ-24.html#ss24.2">Regular Expression</A>
</UL>
<P>
<H2><A NAME="toc25">25.</A> <A HREF="FAQ-25.html">Security Concerns</A></H2>

<UL>
<LI><A NAME="toc25.1">25.1</A> <A HREF="FAQ-25.html#ss25.1">Open-access proxies</A>
<LI><A NAME="toc25.2">25.2</A> <A HREF="FAQ-25.html#ss25.2">Mail relaying</A>
</UL>
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