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<h1><a href="../../index.html">MIT Kerberos Documentation</a></h1>
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<div class="section" id="sserver">
<span id="sserver-8"></span><h1>sserver<a class="headerlink" href="#sserver" title="Permalink to this headline">¶</a></h1>
<div class="section" id="synopsis">
<h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
<p><strong>sserver</strong>
[ <strong>-p</strong> <em>port</em> ]
[ <strong>-S</strong> <em>keytab</em> ]
[ <em>server_port</em> ]</p>
</div>
<div class="section" id="description">
<h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
<p>sserver and <a class="reference internal" href="../../user/user_commands/sclient.html#sclient-1"><em>sclient</em></a> are a simple demonstration client/server
application. When sclient connects to sserver, it performs a Kerberos
authentication, and then sserver returns to sclient the Kerberos
principal which was used for the Kerberos authentication. It makes a
good test that Kerberos has been successfully installed on a machine.</p>
<p>The service name used by sserver and sclient is sample. Hence,
sserver will require that there be a keytab entry for the service
<tt class="docutils literal"><span class="pre">sample/hostname.domain.name@REALM.NAME</span></tt>. This keytab is generated
using the <a class="reference internal" href="kadmin_local.html#kadmin-1"><em>kadmin</em></a> program. The keytab file is usually
installed as <a class="reference internal" href="../../mitK5defaults.html#paths"><em>DEFKTNAME</em></a>.</p>
<p>The <strong>-S</strong> option allows for a different keytab than the default.</p>
<p>sserver is normally invoked out of inetd(8), using a line in
<tt class="docutils literal"><span class="pre">/etc/inetd.conf</span></tt> that looks like this:</p>
<blockquote>
<div><div class="highlight-python"><pre>sample stream tcp nowait root /usr/local/sbin/sserver sserver</pre>
</div>
</div></blockquote>
<p>Since <tt class="docutils literal"><span class="pre">sample</span></tt> is normally not a port defined in <tt class="docutils literal"><span class="pre">/etc/services</span></tt>,
you will usually have to add a line to <tt class="docutils literal"><span class="pre">/etc/services</span></tt> which looks
like this:</p>
<blockquote>
<div><div class="highlight-python"><pre>sample 13135/tcp</pre>
</div>
</div></blockquote>
<p>When using sclient, you will first have to have an entry in the
Kerberos database, by using <a class="reference internal" href="kadmin_local.html#kadmin-1"><em>kadmin</em></a>, and then you have to get
Kerberos tickets, by using <a class="reference internal" href="../../user/user_commands/kinit.html#kinit-1"><em>kinit</em></a>. Also, if you are running
the sclient program on a different host than the sserver it will be
connecting to, be sure that both hosts have an entry in /etc/services
for the sample tcp port, and that the same port number is in both
files.</p>
<p>When you run sclient you should see something like this:</p>
<blockquote>
<div><div class="highlight-python"><pre>sendauth succeeded, reply is:
reply len 32, contents:
You are nlgilman@JIMI.MIT.EDU</pre>
</div>
</div></blockquote>
</div>
<div class="section" id="common-error-messages">
<h2>COMMON ERROR MESSAGES<a class="headerlink" href="#common-error-messages" title="Permalink to this headline">¶</a></h2>
<ol class="arabic">
<li><p class="first">kinit returns the error:</p>
<blockquote>
<div><div class="highlight-python"><pre>kinit: Client not found in Kerberos database while getting
initial credentials</pre>
</div>
</div></blockquote>
<p>This means that you didn’t create an entry for your username in the
Kerberos database.</p>
</li>
<li><p class="first">sclient returns the error:</p>
<blockquote>
<div><div class="highlight-python"><pre>unknown service sample/tcp; check /etc/services</pre>
</div>
</div></blockquote>
<p>This means that you don’t have an entry in /etc/services for the
sample tcp port.</p>
</li>
<li><p class="first">sclient returns the error:</p>
<blockquote>
<div><div class="highlight-python"><pre>connect: Connection refused</pre>
</div>
</div></blockquote>
<p>This probably means you didn’t edit /etc/inetd.conf correctly, or
you didn’t restart inetd after editing inetd.conf.</p>
</li>
<li><p class="first">sclient returns the error:</p>
<blockquote>
<div><div class="highlight-python"><pre>sclient: Server not found in Kerberos database while using
sendauth</pre>
</div>
</div></blockquote>
<p>This means that the <tt class="docutils literal"><span class="pre">sample/hostname@LOCAL.REALM</span></tt> service was not
defined in the Kerberos database; it should be created using
<a class="reference internal" href="kadmin_local.html#kadmin-1"><em>kadmin</em></a>, and a keytab file needs to be generated to make
the key for that service principal available for sclient.</p>
</li>
<li><p class="first">sclient returns the error:</p>
<blockquote>
<div><div class="highlight-python"><pre>sendauth rejected, error reply is:
"No such file or directory"</pre>
</div>
</div></blockquote>
<p>This probably means sserver couldn’t find the keytab file. It was
probably not installed in the proper directory.</p>
</li>
</ol>
</div>
<div class="section" id="see-also">
<h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
<p><a class="reference internal" href="../../user/user_commands/sclient.html#sclient-1"><em>sclient</em></a>, services(5), inetd(8)</p>
</div>
</div>
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<h2>On this page</h2>
<ul>
<li><a class="reference internal" href="#">sserver</a><ul>
<li><a class="reference internal" href="#synopsis">SYNOPSIS</a></li>
<li><a class="reference internal" href="#description">DESCRIPTION</a></li>
<li><a class="reference internal" href="#common-error-messages">COMMON ERROR MESSAGES</a></li>
<li><a class="reference internal" href="#see-also">SEE ALSO</a></li>
</ul>
</li>
</ul>
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<h2>Table of contents</h2>
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="../../user/index.html">For users</a></li>
<li class="toctree-l1 current"><a class="reference internal" href="../index.html">For administrators</a><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="../install.html">Installation guide</a></li>
<li class="toctree-l2"><a class="reference internal" href="../conf_files/index.html">Configuration Files</a></li>
<li class="toctree-l2"><a class="reference internal" href="../realm_config.html">Realm configuration decisions</a></li>
<li class="toctree-l2"><a class="reference internal" href="../database.html">Database administration</a></li>
<li class="toctree-l2"><a class="reference internal" href="../lockout.html">Account lockout</a></li>
<li class="toctree-l2"><a class="reference internal" href="../conf_ldap.html">Configuring Kerberos with OpenLDAP back-end</a></li>
<li class="toctree-l2"><a class="reference internal" href="../appl_servers.html">Application servers</a></li>
<li class="toctree-l2"><a class="reference internal" href="../host_config.html">Host configuration</a></li>
<li class="toctree-l2"><a class="reference internal" href="../backup_host.html">Backups of secure hosts</a></li>
<li class="toctree-l2"><a class="reference internal" href="../pkinit.html">PKINIT configuration</a></li>
<li class="toctree-l2"><a class="reference internal" href="../otp.html">OTP Preauthentication</a></li>
<li class="toctree-l2"><a class="reference internal" href="../princ_dns.html">Principal names and DNS</a></li>
<li class="toctree-l2"><a class="reference internal" href="../enctypes.html">Encryption types</a></li>
<li class="toctree-l2 current"><a class="reference internal" href="index.html">Administration programs</a><ul class="current">
<li class="toctree-l3"><a class="reference internal" href="kadmin_local.html">kadmin</a></li>
<li class="toctree-l3"><a class="reference internal" href="kadmind.html">kadmind</a></li>
<li class="toctree-l3"><a class="reference internal" href="kdb5_util.html">kdb5_util</a></li>
<li class="toctree-l3"><a class="reference internal" href="kdb5_ldap_util.html">kdb5_ldap_util</a></li>
<li class="toctree-l3"><a class="reference internal" href="krb5kdc.html">krb5kdc</a></li>
<li class="toctree-l3"><a class="reference internal" href="kprop.html">kprop</a></li>
<li class="toctree-l3"><a class="reference internal" href="kpropd.html">kpropd</a></li>
<li class="toctree-l3"><a class="reference internal" href="kproplog.html">kproplog</a></li>
<li class="toctree-l3"><a class="reference internal" href="ktutil.html">ktutil</a></li>
<li class="toctree-l3"><a class="reference internal" href="k5srvutil.html">k5srvutil</a></li>
<li class="toctree-l3 current"><a class="current reference internal" href="">sserver</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../../mitK5defaults.html">MIT Kerberos defaults</a></li>
<li class="toctree-l2"><a class="reference internal" href="../env_variables.html">Environment variables</a></li>
<li class="toctree-l2"><a class="reference internal" href="../troubleshoot.html">Troubleshooting</a></li>
<li class="toctree-l2"><a class="reference internal" href="../advanced/index.html">Advanced topics</a></li>
<li class="toctree-l2"><a class="reference internal" href="../various_envs.html">Various links</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../../appdev/index.html">For application developers</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../plugindev/index.html">For plugin module developers</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../build/index.html">Building Kerberos V5</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../basic/index.html">Kerberos V5 concepts</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../mitK5features.html">MIT Kerberos features</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../build_this.html">How to build this documentation from the source</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../about.html">Contributing to the MIT Kerberos Documentation</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../resources.html">Resources</a></li>
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