Installing KB5000871 - Error writing dll

Sist 1 Reputation point
2021-03-05T09:05:06.62+00:00

Hello. I'm trying to install this kb due to 0day vulnerability in my Exchange 2013. I have a DAG but when I try to install, fails because says some dll are not accesible. I have checked my user has all the permissions to access and write that dll. I tried to copy the dll from the other Exchange 2013 and for some of them, it worked but then, there's another that fails so I can't go on with the update. Some of the dll that fails are in forder: %exchangeserver%\FrontEnd\HttpProxy\bin Any idea about how I can solve it would be appreciated.

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.
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  1. Ashok M 6,506 Reputation points
    2021-03-07T12:32:15.86+00:00

    Hi @Sist

    Do you have any Antivirus installed on the Exchange server? If so try disabling it and install the update.
    If it still fails, share the error message covering personal information.

  2. Eric Yin-MSFT 4,386 Reputation points
    2021-03-08T02:24:12.257+00:00

    Hi,
    Have you tried copy the DLL files from the other server this time (you'd better make a backup before doing this)?
    I'm asking this because another issue is solved this way: https://learn.microsoft.com/en-us/answers/questions/299032/kb5000871-killed-my-exchange-2013-server.html

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