We have OEM Grid Control 11g installed on Linux server. And we have Oracle 11gR2 RAC database on HP-UX server. I installed and configured OEM Agent on both RAC servers and it was working with out any issue, I was able to monitor from Grid Control. We have 3 RAC databases on the RAC server and I was able to monitor all 3.
Since yesterday I am getting the following error for on Grid Control for first node of the RAC for one database, other 2 databases are fine.
Status: Failed
Details: Failed to connect to database instance: ORA-12537: TNS:connection closed (DBD ERROR: OCIServerAttach).
But I am able to connect the database (both the instances) using TOAD or some other SQL Client. I stopped and restarted the agent but no changes.
I am not sure where to look into it, can some one help me to understand the issue.