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    Exchange 7/2021 Security Updates issues with OWA

    IT Discussion
    exchange 2013 exchange 2016 exchange 2019 microsoft security oauth
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    • dbeatoD
      dbeato
      last edited by

      For anyone having issues accessing OWA or ECP on Exchange 2013/2016 or 2019 after the Security Updates of last night (They deployed Exchange patches through Windows Updates)
      this is what I have been using to fix the access https://docs.microsoft.com/en-us/exchange/troubleshoot/administration/cannot-access-owa-or-ecp-if-oauth-expired

      even if the OAuth Certificate is not expired

      dbeatoD 1 Reply Last reply Reply Quote 2
      • dbeatoD
        dbeato @dbeato
        last edited by

        @dbeato More on the Exchange 2013/2016 and 2019 troubleshooting. Exchange 2013 is what I have narrowed down to the issue with OWA and ECP with error 500 and the fix as above works. However the Exchange 2016 CU21 and Exchange 2019 CU10 have an issue with Security Clients with AMSI as below https://borncity.com/win/2021/07/13/exchange-2016-2019-outlook-probleme-durch-amsi-integration/
        https://www.frankysweb.de/exchange-2016-2019-amsi-integration-sorgt-fuer-probleme-mit-outlook/
        Disabling AMSI on the server with the WEb.config file hasn't fixed it yet, in our case we had to disable AMSI on the server and clients for now.

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