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  1. Exit Exchange Management Shell and open a Command Prompt window as an administrator. Run iisreset. Restart the server, and verify that you no longer get an error message when you access ECP. OWA/ECP stops working after a security update is manually installed on Exchange server without elevated permissions.
    learn.microsoft.com/en-us/exchange/troubleshoot/c…
    If all fails and still the Exchange Control Panel (ECP) is not working, you can look into re-generating the ECP Virtual Directory. This can be done from the server using PowerShell. This could be a little bit tricky as this could make the situation even worse.
    www.stellarinfo.com/blog/exchange-control-panel-n…
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  3. OWA or ECP stops working after you install a security update

  4. [Solved] - Cannot Access ECP on New Exchange 2019 …

    WEBDec 18, 2023 · Summary: When accessing the Exchange Admin Center (EAC), you may not be able to login and experience an error - Could not load file or assembly. In this post, we will be discussing the possible …

  5. How to Fix HTTP ERROR 500 in ECP/EAC after Login

    WEBNov 25, 2022 · Solutions to Fix HTTP ERROR 500 in Exchange Server. Follow these solutions in the given sequence to troubleshoot and fix the HTTP 500 error in Exchange Server EAC/ECP after login. Solution 1: …

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