Microsoft has released Security Updates (SUs) for vulnerabilities found in:
Exchange Server 2013
Exchange Server 2016
Exchange Server 2019
SUs are available in a self-extracting auto-elev...
Updated Oct 11, 2022
Version 2.0
Blog Post
I have following sequence before the error
Event 2050 - RecycleCafeApplicationPool-MSExchangeMapiFrontEndAppPool-OutlookMapiHttpProxyTestRecycleAppPool: Throttling allowed the operation to execute
Event 1020 - Starting recovery action (Action=RecycleCafeApplicationPool, Resource=MSExchangeMapiFrontEndAppPool, Requester=OutlookMapiHttpProxyTestRecycleAppPool, ThrottlingMode=None)
Event 2051 - WatsonDump-MSExchangeMapiFrontEndAppPool-OutlookMapiHttpProxyTestRecycleAppPool: Throttling rejected the operation
Event 1500 - Attempting to kill process. (Id=21572, Name=w3wp, IsChild=False, Context=221014.011429.45723.034)
Event 1502 - Successfuly killed the process. (Id=21572, Name=w3wp, IsChild=False, Context=221014.011429.45723.034)
Event 1022 - Recovery action succeeded. (Action=RecycleCafeApplicationPool, Resource=MSExchangeMapiFrontEndAppPool, Requester=OutlookMapiHttpProxyTestRecycleAppPool)
In the System log there is then
Event 5011 - "WAS - Fatal Communications Error..." that corresponds with 1502 (kill)