There is a line in the ../Tomcat5.5/conf/tomcat-users.xml file that goes like: <user username="admin" password="" roles="admin,manager"/> This is the default setting that comes with the installation. It suggests filling in a blank as password, but that doesn't work.
Hi I have tomcat 5.5.7 installed and i used (first time after installing Admin JMX console) the username and password i used for tomcat manager and it works , i suggest ou use the user/password of your tomcat manager for administration console hope it helps