Active Sync Not Working HTTP 401 Error (Full Version)

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pflay -> Active Sync Not Working HTTP 401 Error (6.Feb.2018 9:40:26 AM)


Recently users have stopped receiving emails on their mobiles when they are not connected to their office network (i.e using mobile data), and emails cannot be setup on new phones.

Microsoft Connectivity Analyzer gives the following:

The Exchange ActiveSync test failed.

Additional Details

Elapsed Time: 4801 ms.

Test Steps

Attempting to resolve the host name *.* in DNS.
The host name resolved successfully.

Additional Details
Testing TCP port 443 on host *.* to ensure it's listening and open.
The port was opened successfully.

Additional Details
Testing the SSL certificate to make sure it's valid.
The certificate passed all validation requirements.

Additional Details

Test Steps
Checking the IIS configuration for client certificate authentication.
Client certificate authentication wasn't detected.

Additional Details
Testing HTTP Authentication Methods for URL https://*.*
The HTTP authentication methods are correct.

Additional Details
An ActiveSync session is being attempted with the server.
Errors were encountered while testing the Exchange ActiveSync session.

Additional Details

Test Steps

Attempting to send the OPTIONS command to the server.
Testing of the OPTIONS command failed. For more information, see Additional Details.
Tell me more about this issue and how to resolve it

Additional Details

An HTTP 401 Unauthorized response was received from the server. This may be the result of invalid credentials or a configuration problem on the Exchange Server.
HTTP Response Headers:
Content-Length: 1293
Content-Type: text/html
Date: Tue, 06 Feb 2018 15:28:57 GMT
Server: Microsoft-IIS/7.0
WWW-Authenticate: Basic realm="*.*"
X-Powered-By: ASP.NET
Elapsed Time: 2620 ms.

The credentials used to test login with no problem to OWA.

ActiveSync has been working without problems until now. Any ideas?

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