I was wondering if anyone has seen this issue or if they know what log file I should look in to troubleshoot the issue.

We have GW8 on Linux (OES2)
All user lost connect to the POA. When I check the GW services on the server the POA was reporting as DEAD.
I restarted the GW service and user are now able to get back in to GW.

Has any one got ideas on how this could happen?