Hello Albert,
When the hserver wants to connect to your Oracle database it will use the userid and password found in your hsvr.dfo file (on Unix/Linux it will be the .hsvr.dfo file). In your case it looks like the wrong username and/or password has been stored there. You will need to generate a new file.
From a command prompt window execute:
svrenc -s
The utility will prompt you for a userid and password. You should provide the Oracle login credentials for the Harvest database schema. After the utility finishes you should check your %CA_SCM_HOME% (or $CA_SCM_HOME on Unix/Linux) to assure that the timestamp on the hsvr.dfo file has been updated. Then, try to start the hserver again from a command prompt window.
Let me know if this answers your question.
Thanks,
Melinda Skelton
CA Technologies Support Team