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Normaly this is because the password of the agent is not correct or working.1 person found this helpful
Reset the pasword of the dbsnmp user and/or unlock account. After some time the problem is solved
I tested dbsnmp credentials from gridcontrol and result was successful. I also went through all named and preferred credentials and they are all set and tests all resulted successful.
The bellow solution found elswhere in forum, solved my issue.
/u01/app/oracle/agent12c/bin/emctl stop agent
rm -r state/*
rm -r collection/*
rm -r upload/*
/u01/app/oracle/agent12c/bin/emctl clearstate agent
/u01/app/oracle/agent12c/bin/emctl start agent
/u01/app/oracle/agent12c/bin/emctl upload agent