Exchange 2019 CU11 ASP.NET error

Question

Hi all,

I have an issue after we Updated an Exchange 2019 to CU11.

On Event Viewer we are having the following error

Log Name: Application
Source: ASP.NET 4.0.30319.0
Date: 29/10/2021 10:44:22
Event ID: 1325
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: XXX

Description: An unhandled exception occurred and the process was terminated.

Application ID: /LM/W3SVC/2/ROOT/EWS

Process ID: 28424

Exception: System.MissingMethodException

Message: Unable to retrieve thread information.
'Microsoft.Exchange.WebServices.Data.GetClientExtensionResponse Microsoft.Exchange.WebServices.Data.ExchangeService.GetClientExtension(Microsoft.Exchange.WebServices.Data.StringList, Boolean, Boolean, System.String, Microsoft.Exchange.WebServices.Data.StringList, Microsoft.Exchange.WebServices.Data.StringList, Boolean, Boolean)'.

I will appreciate any advice about this issue.

All Exchange services are working well.

Best regards,

Manuel

Answer 1

Hi @Manuel Galdámez ,

As regards to the concern that the issue occurred after upgrading Exchange 2019 to CU11, I tried searching around but so far haven't seen similar reports. Given this, may I know if you have noticed any other potentially relavent events recored in the Event Viewer?

Besides, based on my research, "System.MissingMethodException" including in the error could be related to the Exchange Web Services Managed API. So please have a check to see if the Exchange Web Services Managed API is installed on the Exchange server where you are seeing the error. If yes, considering that normally it's not recommended to have Exchange Web Services Managed API installed on the Exchange server, so it's suggested to uninstall it and see if the event 1325 can be stopped.

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