The default Administration Console session timeout value is 30 minutes. You can modify this value for a longer or a shorter period based on your security needs in the web.xml file.
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