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Autodiscover not working after exchange server 2019 cumulative update 11

Andrew Townsend 101 Reputation points
2021-11-05T17:46:31.983+00:00

The following error happens when entering https://mail.contso.com/discover

Server Error in '/Autodiscover' Application.

Parser Error
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.

Parser Error Message: Could not load type 'Microsoft.Exchange.HttpProxy.ProxyApplication'.

Source Error:

Line 1: <%@ Application Language="C#" Inherits="Microsoft.Exchange.HttpProxy.ProxyApplication" %>

Source File: /Autodiscover/global.asax Line: 1

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4110.0

Exchange | Exchange Server | Management
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  1. Andrew Townsend 101 Reputation points
    2021-11-11T09:48:06.963+00:00

    Thanks for your help

    I have fixed it now it was the web.config file in the httproxy/autodiscover that was corrupted/missing information and i got another one from a working exchange server 2019 cu11

    Thanks

    Andy

    1 person found this answer helpful.

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  1. Aaron Xue-MSFT 2,596 Reputation points Microsoft External Staff
    2021-11-08T08:22:08.27+00:00

    Hi,@Andrew Townsend

    According to your information. I think the problem is caused by the Virtual Directory of Autodiscover.

    I would suggest recreating the Autodiscover Virtual Directory.

    Follow these steps to run the commands in Exchange management Shell:

    1.Get the full name of the Autodiscover virtual directory
    Get-AutodiscoverVirtualDirectory -Server "ServerName" | Format-List Server, Name, Identity
    147286-1.png

    2.Delete the Autodiscover virtual directory
    Remove-AutodiscoverVirtualDirectory -Identity "ServerName\Autodiscover (Default Web Site)" -Confirm:$false
    147278-2.png

    3.Create a new Autodiscover Virtual Directory
    New-AutodiscoverVirtualDirectory -Server "ServerName" -BasicAuthentication $true -WindowsAuthentication $true
    147258-3.png

    4.Restart IIS or reboot the Exchange Server.

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  2. Martin Wiechmann 1 Reputation point
    2022-04-21T20:26:00.507+00:00

    I am having exactly the same problem for /OAB. Rebuilt the virtual directories, Rebuilt both sharedwebconfigs, Ran setup again, no dice. Any further ideas? The OAB itself seems to create and update just fine, its seemingly just the web application part that is not working.

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