I'm running Oracle 9.2 on Redhat Pro 9.0. The plain vanilla features work fine. But those features that require stored preferred credentials, e.g., data guard, don't work because the system won't store the preferred credentials.
From the OEM/Config/Pref/Pref Cred tab, I set the preferred credentials for databases, nodes, ..., but the changes aren't persistent. I've gone through this same drill on Windows 2000 Server and the changes I made to the preferred credentials were persistent.