Sometime back, I faced a weird issue when working on changing WebLogic password for one of the FWM products (followed the Oracle Note ID: How to Change the WebLogic Server Administrator Password [ID 1082299.1]).
The password was successfully changed and I was able to get into WebLogic Console immediately after starting the services. But, after 10-15 mins, when I try to login, it was failing with the error message “Authentication Failed”
After a couple of hours research, I found that, OEM blackout was removed on the FWM target, which was trying to connect to WebLogic with the old password and it locked the user account. I had to remove the FWM target from monitoring and add it back with the new WebLogic Password, which fixed the issue.