Make sure that you are able to connect to apps and system users right before you run adop.
Maybe there is a change of the input language or other minor issue you faced while running adop.
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What is the value of SEC_CASE_SENSITIVE_LOGON parameter on database.
If its true then make it false and try again.
Hope this helps!
I'm a moron... I've tested the login from dbTier, testing from appTier the cause was clear: the listener are stopped
Just saying... I dont know why adop cannot catch the real problem, and throws a "Invalid user credentials" error, that is a simplistic assumption
Thank you very much for the replies