The web.xml file for Tomcat specifies how long an Administration Console session can remain inactive before the session times out and the administrator must authenticate again. The default value is 30 minutes.
To change this value:
Change to the Tomcat configuration directory:
Linux: /opt/novell/nam/adminconsole/conf/web.xml
Windows Server 2012: \Program Files (x86)\Novell\Tomcat\conf
Open the web.xml file in a text editor and search for the <session-timeout> parameter.
Modify the value and save the file.
Restart Tomcat:
Linux: /etc/init.d/novell-ac restart OR rcnovell-ac restart
Windows: net stop Tomcat7 net start Tomcat7