This problem is not related to SSO,Forget the password of database user or DBA user either, it is related SQL server.Check with the SQL server guys.I can suggest you for that.There would be an user called "sa" in SQL server,this user has all the privilege, login to SQL server through this user, then reset the password of RSA_USER and RSA_DBA.If your SQL server is installed in windows authentication, then login to SQL server with the windows authentication and do the same.