ORA-01017: invalid username/password in gcagent.log

OEM 13.5

There are some Metrics which are no longer updating or showing any values anymore, and for that I was checking the Oracle Agent itself. In a log file - gcagent.log to be specific - I found an ORA-01017 Invalid Username Password.

As always, from this error it's not possible to get to know what user, or certainly not what password was attempted, but I can tell this: the database runs OK. All manual connection attempts work, so it's only here where I find something replying: Invalid Username/Password.

So, I guess the password was actually changed, and whatever reads the given password now has a wrong password.