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PAM Authentication Error: User not known to the underlying authentication module - Connect IT Community | Kaseya
<main> <article class="userContent"> <h2 data-id="summary"><strong>SUMMARY</strong></h2> <p>Oracle backup fails</p> <h2 data-id="issue"><strong>ISSUE</strong></h2> <p>Oracle DB fails with error, PAM Authentication Error: User not known to the underlying authentication module.</p> <h2 data-id="resolution"><strong>RESOLUTION</strong></h2> <p>On the Linux box you should be able to run:<br><br>cat /etc/oratab<br><br>This will give you a list of databases deployed on the current system. It will be a : separated list of sid:home:boot. For each unique home path you should run the following:<br><br>export ORACLE_HOME=home<br>${ORACLE_HOME}/bin/osdbagrp<br><br>This will give you the oradba system group used to manage the Oracle Instance. Using this group run:<br><br>lid -g group<br><br>That command should give you a list of users that could be used as system level oracle dbas for that unique home.</p> <h2 data-id="cause"><strong>CAUSE</strong></h2> <p>The Oracle backup needs to have a user that is known by the Linux OS and the Oracle DB. A good choice is the user that was used while installing the Oracle instance.</p> </article> </main>