The Tomcat administrative login is a separate login from the GX WebManager login. The username and password are not stored in GX WebManager, but in Tomcat. The login and password are typically defined in the file "<tomcat dir>/conf/tomcat-users.xml". The exact location can be determined from the main Tomcat configuration file "server.xml", which contains lines like below:
The contents of the user database file look something like this:
For details on Tomcat's container managed security system, examine the Tomcat Realm Configuration HOWTO.
Tips & Tricks
When you need to log in to be able to access a certain URL, e.g. for XMLdebug and you don't want to lose that URL, leave the URL intact and insert "/admin" after "/web". GX WebManager will respond by asking for a username and password. After you logged in, remove the "/admin" from the URL.