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autodiscover webexception error 413

Abdul Farooque Arian 106 Reputation points
2021-10-03T04:38:22.77+00:00

Hi,

Env= TWO Ex 2013 both with CAS+MB roles

server 1 and server 2
Autodiscover was not working and

I also recreated the auto discover virtual directory on one server let say server 2

getting error as below

Attempting to send an Autodiscover POST request to potential Autodiscover URLs.

Autodiscover settings weren't obtained when the Autodiscover POST request was sent.

Additional Details

Elapsed Time: 257 ms.

Test Steps

The Microsoft Connectivity Analyzer is attempting to retrieve an XML Autodiscover response from URL https://autodiscover.domain.com:443/Autodiscover/Autodiscover.xml for user user@keyman .com.

The Microsoft Connectivity Analyzer failed to obtain an Autodiscover XML response.

Additional Details

A Web exception occurred because an HTTP 413 - 413 response was received from Unknown. HTTP Response Headers: X-FEServer: server2 Connection: close Content-Length: 0 Date: xxxxxx 17:15:48 GMT Server: Microsoft-IIS/8.5 X-Powered-By: ASP.NET

Elapsed Time: 257 ms.

WHY THIS WEB EXCEPTION?

i have two autodiscover public dns entries

autodisover.domain.com === A record

CNAME entry is autodiscover.domain.com ===mail.domain.com

Exchange | Exchange Server | Management
Exchange | Exchange Server | Management
The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.
Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
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  1. Abdul Farooque Arian 106 Reputation points
    2021-10-05T19:31:15.593+00:00

    Hi,

    I sorted out this as firewall was blocking auto discover from CAS to Mailboxes
    Test-outlookwebservices and test-outlookconnectivity gave me this insight.

    Allowing port 443 worked.

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  1. KyleXu-MSFT 26,396 Reputation points
    2021-10-04T02:17:05.633+00:00

    @Abdul Farooque Arian

    I would suggest you use Outlook "Test Email AutoConfiguration" function to test the Exchange Autodiscover, because the Microsoft Connectivity Analyzer isn't stable recently. In order to verify the external connection, you need to use a computer outside the domain to verify the autodiscover.
    137217-qa-kyle-10-06-47.png

    The Log label will show you the Autodiscover lookup process.

    By the way, I think the CNAME isn't needed, It increases the number of hops for DNS resolution.

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