When trying to validate the server definition in WCC configuration tab which has Web Service URL defined, it fails with message
Release : 12.0
For some reason, AEWS kept somehow the cache of old credential and did not release until bouncing AEWS.
Check if Monitor Id is part of WorkloadAutomationAEWebService group.
Check if password of Monitor Id is correct.
If all correct, try the following step
Stop and restart the Autosys web server.