Hi,
after upgrading to Exchange 2013 CU1, I get the following errors in the eventlog for all Exchange Application pools. These errors show up every 5 to 10 minutes:
A process serving application pool 'MSExchangeECPAppPool' suffered a fatal communication error with the Windows Process Activation Service. The process id was '8068'. The data field contains the error number.
A process serving application pool 'MSExchangeOWAAppPool' suffered a fatal communication error with the Windows Process Activation Service. The process id was '8248'. The data field contains the error number.
A process serving application pool 'MSExchangePowerShellFrontEndAppPool' terminated unexpectedly. The process id was '8652'. The process exit code was '0xffffffff'.
Exchange 2013 CU1 is running on Windows 2012.
Franc.