I have a cluster of 2 IIS web servers on Windows Server 2008 R2. They had been running on CF10 for over a year (if not two) with no problems. I upgraded one server to CF11 and now that server is crashing while the CF10 servers is still running fine.
In the Windows event log I'm seeing 4 instances of this error:
"A process serving application pool '******' suffered a fatal communication error with the Windows Process Activation Service. The process id was '4652'. The data field contains the error number."
Then finally:
"Application pool '******' is being automatically disabled due to a series of failures in the process(es) serving that application pool.".
Looking at the application pool in the IIS admin it is stopped. Restarting will resolve but it will eventually crash.
What could be the issue?
-Phil