Exchange E12IIS w3wp.exe crashes daily

Arch 1 Reputation point
2020-07-28T11:39:58.33+00:00

For a long time Exchange server 2019 has been having multiple daily w3wp.exe crashes for MSExchangeOWAAppPool
Server is currently running CU5 and I'm planning to update it to CU6 soon. The issue also existed on CU2 before it was updated to CU5.
The exchange service seems to be unaffected from users point of view but I'm afraid of other issues this could cause along the way. I would like to dig deeper to find the cause of this repeating crash, but so far have not been able to find much information specific to the crash in question.
I attempted to do some debugging but have so far been unsuccessful in using the information to find a cause.

Any help on understanding this issue better and solving it is welcome.

Example of one of the crashes below:

Source
w3wp

Summary
E12IIS

Date
‎28.‎07.‎2020 09:59

Status
Report sent

Problem signature
Problem Event Name: E12IIS
flavor: c-RTL-AMD64
appVersion: 15.02.0595.003
appName: w3wp#MSExchangeOWAAppPool
assemblyName: M.E.C.Owa2.Server
exMethodName: M.E.C.O.S.C.OwaMapiNotificationManager.SubscribeToSuiteNotification
exceptionType: System.NotSupportedException
callstackHash: 80d2-dumptidset
assemblyVer: 15.02.0595.003
OS Version: 10.0.17763.2.0.0.272.7
Locale ID: 1061

Extra information about the problem
Bucket ID: fc047ad476605c9a99d8eea5dd02e748 (1862500842062669640)

As in image below crashes are happening multiple times per day:

14028-annotation-2020-07-28-142319.png

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
7,335 questions

2 answers

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  1. TimCerling(ret) 1,156 Reputation points
    2020-07-28T13:23:29.007+00:00

    You have asked about a problem with Microsoft Exchange. This forum is for general question about Windows Server. Microsoft Exchange has its own forum located at https://learn.microsoft.com/en-us/answers/topics/office-exchange-server-itpro.html You will reach more Exchange experts by posting to the Exchange forum.

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  2. KyleXu-MSFT 26,206 Reputation points
    2020-07-29T02:34:18.913+00:00

    Does the above picture from your monitoring tool? Does there exist any antivirus software on your Exchange server? If there are, I would suggest you try to uninstall all of them.

    Because those tools may block or limited the Exchange server read/write permission for OWA virtual directory, which may caused this service crashed. So, try to completely uninstall those tool, then check whether is this phenomenon gone.

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