I installed Netbeans and tryed to access the server's manager using: (id/pass)manager/manager, admin/admin, system/password... None of them worked.
My answer is tested on Windows 7 with installation of NetBeans IDE 6.9.1 which has bundled Tomcat version 6.0.26. The instruction may work with other tomcat versions according to my opinion.
If you are starting the Apache Tomcat server from the Servers panel in NetBeans IDE then you shall know that the Catalina base and config files used by NetBeans IDE to start the Tomcat server are kept at a different location.
Steps to know the catalina base directory for your installation:
conf/tomcat-users.xmlis located and which you want to open and read.
My Computerand go to the conf directory where you will find the actual
tomcat-users.xmlfile used by NetBeans IDE. NetBeans IDE comes configured with one default password with
username="ide"and some random password, you may change this username and password if you want or use it for your login also
http://localhost:8084/manager/which shall be