question

MickaelKane-4867 avatar image
0 Votes"
MickaelKane-4867 asked YukiSun-MSFT commented

OWA & ECP broken after installing July Security Update on Exchange 2013 & 2016

Hello, we have 4 Exchange Server 2013 and 2 Exchange Server 2016 in our organization. A few days after patching all the servers with July security updates, the OWA and ECP stopped working. We did reboot the servers after the patching and OWA & ECP was still working, issue started 5 days after.

Error message is "HTTP 500 Could not load file or assembly Microsoft.Exchange.Common, Version=15.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified". This happens on all the servers (2013 and 2016). So far, after checking the Internet, we did the following actions without success:
- Reinstall the Security Patch in a Run As Admin CMD
- Follow the steps to check the BinSearchFolder configuration
- Execute UpdateCas.ps1 and UpdateConfig.ps1
- Checked the web.config files
- Checked the OAuth Certificate (it is still valid and good)
- Uninstall the Security Patch

Nothing is working, and we are a little bit lost.
Event ID 1310 is popping regularly in the Event Viewer of all the Exchange Servers with the same message as the error we have when we tried to connect to the ECP...

Any ideas ?

Thanks


office-exchange-server-administrationoffice-exchange-online-itpro
· 2
5 |1600 characters needed characters left characters exceeded

Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.

Hi @MickaelKane-4867

-Follow the steps to check the BinSearchFolder configuration
-Execute UpdateCas.ps1 and UpdateConfig.ps1

According to the resolution provided in this offical document, it's required to run IISreset and restart the server after running the scripts: .\UpdateCas.ps1 and .\UpdateConfigFiles.ps1. So if this hasn't been done earlier, it's suggested to follow all the steps in the article and see if there would be any improvement.


If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

0 Votes 0 ·

Hi @MickaelKane-4867,

I am writing to see how everything is going on with this thread. Are you able to access OWA and ECP now?


If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

0 Votes 0 ·

0 Answers