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Remtek-3775 asked JadeLiang-MSFT commented

Exchange Servver Update to CU21 fails

I completed the ADprep and started the update to CU21
Everything seem to be going fine but then I started getting errors
The process fails while step:
Mailbox role: Transport
Microsoft ExchangeServiceHost will not start.

Unable to start most of the MsExchnage Services
Web UI does not start at all.

Also getting tons of Event ID 2280 errorw:
The Module DLL C:\Program Files\Microsoft\Exchange Server\V15\Bin\kerbauth.dll failed to load. The data is the error.

office-exchange-server-administrationoffice-exchange-server-itpro
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Remtek-3775 avatar image
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Remtek-3775 answered JadeLiang-MSFT commented

The problem was fixed by copying the application files from the CU21 Source ISO to the common folder in the installation path on the server.
It seems that during the update process not all files were copied. The Microsoft Exchange Active Directory Service could not start because it was trying to use the service file from the previous CU version.
Once the correct files from CU21 was copied over all of the services were able to start and the update completed without any further problems.
Once the update was complete a reboot was needed. After reboot I applied the latest security update for CU21 and then everything started working again.

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Hi @Remtek-3775 ,
Glad to see your issue has been resolved and thanks for your sharing.

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Remtek-3775 answered

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JadeLiang-MSFT answered JadeLiang-MSFT commented

Hi @Remtek-3775 ,

I understand that you are facing with cannot start some services on computer when you update exchange server. As I know, it may occur when your services were disabled and couldn’t be set to “automatic” during the updating, in this case, it’s recommended to follow this document to check if your services were disabled and set them to automatic for testing .

If the issue still exists after that, based on my research, I found a similar thread that mentioned the version of Unified Communications Managed API 5.0 may affect it, if you are also working with UCMA 5.0, please try to uninstall it and install version UCMA 4.0 to check.

Also getting tons of Event ID 2280 error:

For this error, as I know, it may occur when the path of kerbauth.dll is different from the latest path where exchange has been installed, if it’s your case, it’s recommended to change the path manually to resolve it, for more information, please refer to this document: The Module DLL kerbauth.dll failed to load. The data is the error. (The Module DLL C:Program FilesMicrosoftExchange ServerV14Binkerbauth.dll failed to load. The data is the error.)(Please note the location is V15 for Exchange 2016).

Hope that would be helpful to you.


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JadeLian-MSFT,
Thank you for your response. unfortunately it did not work.
All services are set to AUTO
FW turned off
AV disabled
Still unable to complete the update to CU21

I did notice that the 2280 Event errors went away after removing UCMA 5.2 and re-installing UCMA 4.0
Now I'm getting dotnet 4.0 misconfigured errors.

Primary error still existist Unable to start the Microsoft Exchange Service Host
This service is dependent on Microsoft Exchange Active Directory Topology Service
It also will not start. All of its dependencies are running.

I updated dotnet to 5.09 but still having the same issues.

More than 24 hours production server down. Any help would be great.

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Hi @Remtek-3775 ,

Thanks for your update, when did you check and set the services(before or during the upgrading)?

Based on my research, I found it may occur when your setting is not quick enough, in this case, it’s recommended to run the command below in PowerShell to set it to check if the issue has any difference, for more information, please refer to this document : Exchange 2016: CU13 upgrade fails with error "Cannot start service MSExchangeServiceHost on computer".

 Get-Service | where{$_.Name –Like ‘MSExchange*’} | set-Service –StartupType ‘automatic’

Or

  while (1 -le 2) { sleep 1 ; Get-Service | where{$_.DisplayName -Like ‘Microsoft Exchange*’} | Set-Service –StartupType ‘Automatic’ }

If that’s invalid, I noticed that your case is urgent, we could try to recover exchange server for your normal use. Also, if your case is very urgent and you need more quicker response, it’s recommended to open a service request to get further support.


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