Have you forgotten the password to, or messed up the security configuration of, your WebSphere Application Server's Deployment Manager? Here's a quick tip on how you can disable security, allowing you to log in again, and reconfigure.

Log into the system that hosts your deployment manager, and change to the deployment manager's profile's bin directory. Then execute:

./wsadmin.sh -conntype NONE
WASX7357I: By request, this scripting client is not connected to any server process. Certain configuration 
and application operations will be available in local mode.

WASX7029I: For help, enter: "$Help help"

wsadmin>securityoff
LOCAL OS security is off now but you need to restart server1 to make it affected.


wsadmin>exit

Then, shutdown and restart your deployment manager. It should come up with security disabled on the admin console.