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<th colspan="3" align="center">LPRng-HOWTO: 1 Apr 2002
(For LPRng-3.8.10)</th>
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<div class="CHAPTER">
<h1><a name="FAQ">Chapter 20. The Most Frequently Asked
Questions</a></h1>
<div class="TOC">
<dl>
<dt><b>Table of Contents</b></dt>
<dt>20.1. <a href="faq.htm#AEN10455">Why do I get
malformed from address errors?</a></dt>
<dt>20.2. <a href="x10483.htm">It was working normally,
then I get connection refused errors</a></dt>
<dt>20.3. <a href="x10515.htm">Job is not in print queue,
but it gets printed!</a></dt>
<dt>20.4. <a href="x10570.htm">Job disappears and is
never printed, but lpr works</a></dt>
<dt>20.5. <a href="x10587.htm">I get messages about bad
control file format</a></dt>
<dt>20.6. <a href="rfc1179.htm">What is RFC 1179, the
Line Printer Daemon Protocol?</a></dt>
<dt>20.7. <a href="x10619.htm">I want to replace lp,
lpstat, etc, but my programs need them</a></dt>
</dl>
</div>
<p>In this section, the Most Frequently Asked Questions have
been placed, together with their answers. You may notice that
some questions have the same answer, but the symptoms appear
differently.</p>
<p>Some of these answers will reference other material in
this FAQ, or the <b class="APPLICATION">LPRng</b> man
pages.</p>
<div class="SECT1">
<h1 class="SECT1"><a name="AEN10455">20.1. Why do I get
malformed from address errors?</a></h1>
<p>This is the number one question asked by most <b class=
"APPLICATION">LPRng</b> users who try to use <b class=
"APPLICATION">LPRng</b> with network printers or other
systems supporting <a href="rfc1179.htm">RFC1179</a>
printing. For details about <b class=
"APPLICATION">LPRng</b> and RFC1179, see <a href=
"rfc1179ref.htm">RFC1179 and <b class=
"APPLICATION">LPRng</b></a>.</p>
<p>The <tt class="LITERAL">malformed from address</tt>
error is usually reported when trying to send a print job
from <b class="APPLICATION">LPRng</b> to other BSD <b
class="APPLICATION">lpr</b> or RFC1179 <b class=
"APPLICATION">lpr</b> implementations, or with network
connected printers that have a built in <b class=
"APPLICATION">lpd</b> server. This is due to the following
RFC1179 rule: <a name="AEN10470"></a></p>
<blockquote class="BLOCKQUOTE">
<p>Servers originate a connection from ports in the range
721-731.</p>
</blockquote>
<br>
<br>
<p>WHY? These are a subset of the 'reserved' ports in UNIX,
and normal users cannot open connections from them. This
provides a small amount of security from UNIX users on the
host 'spoofing' a server.</p>
<p>IMPLICATION: in order to do use a reserved port, the
program must have root privileges. This means the LPR, <b
class="APPLICATION">lpd</b>, <b class=
"APPLICATION">lpq</b>, etc., programs must be installed
SUID root. This can open up a can of worms with regard to
security, but <b class="APPLICATION">LPRng</b> has been
designed to take as much paranoid care as possible to avoid
problems.</p>
<p>WHAT TO DO: When installing <b class=
"APPLICATION">LPRng</b> you will need to install the
executables SUID root. In the <tt class=
"FILENAME">src/Makefile</tt>, you can remove the comment
from the line</p>
<div class="INFORMALEXAMPLE">
<a name="AEN10480"></a>
<pre class="SCREEN">
PERMS=SUID_ROOT_PERMS
</pre>
</div>
and then do <tt class="LITERAL">make install</tt>. This
will install the executables SUID, and owned by root.<br>
<br>
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