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<h1 class="topictitle1">Troubleshoot the iSeries server connection</h1>
<div><p>Each ODBC connection communicates with one database server program
that runs on the iSeries™ server.
This program is referred to as the <span class="uicontrol">host server program</span>.</p>
<p>The name of the Database Server program used with TCP/IP is <span class="uicontrol">QZDASOINIT</span>.
It is normally located in subsystem QUSRWRK, however it can be set up differently
by the system administrator.</p>
<p>Under normal conditions, the program is evoked transparently, and the user
is not required to take action except to verify that the proper subsystems
and communication protocols are running. See the Host server administration
for details on administration of host server jobs.</p>
<p>The most common indication of a connection failure is an error message
from the ODBC driver mentioning a communications link failure.</p>
<p>If ODBC is unable to connect to the iSeries server, perform the following
troubleshooting tasks:</p>
</div>
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<ul class="ullinks">
<li class="ulchildlink"><strong><a href="rzaiiodbc26.htm">Checking the server status</a></strong><br />
Use CWBPING.</li>
<li class="ulchildlink"><strong><a href="rzaiiodbc28.htm">Verifying that subsystems are active</a></strong><br />
TCP/IP-connected ODBC jobs (QZDASOINIT) will run in the QUSRWRK subsystem. Verify that this subsystem is running.</li>
<li class="ulchildlink"><strong><a href="rzaiiodbc29.htm">Verifying that prestart jobs are running</a></strong><br />
IBM<sup>®</sup> ships
the QSERVER/QUSRWRK subsystems to use prestart jobs to improve performance
at job initialization and startup.</li>
<li class="ulchildlink"><strong><a href="rzaiiodbc30.htm">Additional TCP/IP considerations</a></strong><br />
Use NETSTAT, STRTCP, and STRHOSTSVR to verify and start TCP/IP functions.</li>
</ul>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaiiodbc22.htm" title="Helps you solve a few of the more commonly encountered difficulties with iSeries Access for Windows and ODBC. It also identifies several tools that can help you remove performance bottlenecks. You should review this information before contacting technical support.">Troubleshoot ODBC</a></div>
</div>
<div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="rzaiihostserver.htm" title="Describes the host servers that are commonly used with iSeries Access for Windows, and describes how to effectively manage and use them.">Host server administration</a></div>
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