jservException Connection from /172.16.1.2 refused due to authentication failure

We recently encountered an issue with our iStore server where the CPU spiked taking the website offline. The server was still up and running however we were forced to restart Apache to get the server back up and running. The logs were very undescriptive outside of the following error: <jservException> Connection from /172.16.1.2 refused due to authentication failure. Everything has worked fine before/since this incident.
We are running iStore/EBS version 11.5.10 and our overall architecture is one iStore server in the DMZ with an application server and a DB server on our server VLAN all running Oracle Enterprise Linux. What steps can we take to track down this issue to find the root cause? Any help would be appreciated, thanks.

Sharuk wrote:
what Db version
11g r2
What is OS version
OEL 5.9
did you installed cluster
Yes
where the Installation Was when Power goes down ?
This I posted in my question, power went down when it was creating OEM Files (CONFIG: Starting execution: /u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl secure dbconsole -host racnode1 -sid racdb)Simply recreate OEM

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