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binodmaharjan_2020's avatar
binodmaharjan_2020
Copper Contributor
May 23, 2025

Exg 2019 CU15 Error: OWA not login

After installation of CU15 upgrade, OWA/ECP virtual directory got misconfigured or corrupted. 

Task i have tried:

  1. Remove Virtual Directory and created new. --- Not resolved.
  2. Trying with Upgrade from ISO Exchange setup -- Not resolved.
  3. I found article of copymissing.dll script and tried --- Not resolved.

I found 

"C:\Program Files\Microsoft\Exchange Server\V15\Bin\Microsoft.Exchange.HttpProxy.dll"   this dll file missing in my path.

What shall i check or do to resolve this issue? 

Exchange Server

4 Replies

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  • Hestia's avatar
    Hestia
    Copper Contributor
    Jun 03, 2025

    Try to reinstall exchange setup in "Repair Mode" but don't forget to mount the iso

  • VimsTech's avatar
    VimsTech
    Copper Contributor
    Jun 03, 2025

    You may run the DependentAssemblyGenerator.exe tool to regenerate the missing file. Please follow below MS documentation

    https://learn.microsoft.com/en-us/exchange/troubleshoot/client-connectivity/exchange-security-update-issues

  • Dan_Snape's avatar
    Dan_Snape
    Steel Contributor
    May 26, 2025

    Try and re-run the CU install from cmd line with elevated privileges.

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