I installed Netbeans and tryed to access the server\'s manager using: (id/pass)manager/manager, admin/admin, system/password... None of them worked.
Platform NetBeans 7.3, Apache Tomcat 7.0.34 re: Tomcat Manager
I spent 3 days tracking this down because I thought I had a bad install.
On Windows and Linux, NetBeans uses a separate file location for CATALINA_BASE:
http://wiki.netbeans.org/FaqInstallationDefaultTomcatPassword
So you can modify the tomcat_user.xml under CATALINA_HOME: until your face turns blue, to no effect.
It appears that the IDE only requires, manager-script,admin roles under CATALINA_BASE:.
When I tried to add a user to the manager-gui role (to the correct tomcat_user.xml file), required for access to the Tomcat Manager, Tomcat stopped presenting the login dialog and went directly to the 401 access denied splash page.
It appears that the NetBeans package uses a locked-down version of TomCat.
I hope this saves everyone some time.