Two days back I ran into an issue where I was not able to login to my OEM12c test environment using any of the account. This happened after OEM database upgrade. Recently I did upgrade of my OEM database from 11.2.0.2 to 12.1.0.1 followed by upgrade to 12.1.0.2.

After upgrade was done successfully I tried to login to OEM using my account “dksharma” it gave me error, then I tried using the “sysman” but login failed again. All other users also ┬áreported the same issue.

I have document all  my findings and solution to that in the attached document. If you also face the same Issue you use to document to fix your problem.

em12c-login-failed

Regards

ADDKS