Steps to modify the global session timeout interval:
1. Go to <ADManager Plus installation drive>/ManageEngine/ADManager Plus/webapps/adsm/WEB-INF
2. Open the web.xml file.
3. Search for <session-timeout>. Once you find it, change the default value 1 to the desired value (should be in minutes).
4. Save and close the file.
Note: If the session timeout value is -1 then the session will never expire.