An Unsupported Authentication Method was Found

Topic Last Modified: 2009-08-18

The Microsoft Remote Connectivity Analyzer sends an HTTP GET request to test the authentication methods of the specified service using the URL entered during the test. When the Exchange Server receives the request, it responds with a list of accepted authentication methods. This list is contained in the WWW-Authenticate field of the response header. If an unsupported authentication method is returned in this list, then the following error can be displayed.

"Authentication method "0" is enabled but isn't an allowed Authentication method for this service."

Where "0" is replaced with the unsupported authentication method(s) that were found.

This error prevents users from being able to successfully connect to the specified service.

For More Information

This error is primarily reported when testing Exchange ActiveSync and Integrated Windows Authentication is advertised by the server. Integrated Windows Authentication isn't a supported Authentication method for Exchange ActiveSync and can cause Windows Mobile devices previous to Windows Mobile 6.0 to fail to connect.


If you are using ISA Server to perform pre-authentication, Integrated Authentication may be enabled on the Web Listener. If you do not plan to support devices older than Windows Mobile 6.0 (or if you are not experiencing problems), then you can ignore this error.

To correct this error

  1. Confirm that the proper authentication methods are selected for the virtual directories in Internet Information Services (IIS).

  2. To see a list of the default authentication methods for Exchange Server 2007 applications and services, see Default settings for Exchange-related virtual directories in Exchange Server 2007.

  3. For information about the supported authentication methods available for managing Exchange applications hosted on an Exchange 2007 Client Access Server, see Managing Client Access Security.

  4. For more information about configuring authentication specific to Exchange 2007 Outlook Anywhere, see How to Configure Authentication for Outlook Anywhere.

  5. For information about configuring authentication for Web applications on Exchange Server 2003 and Exchange 2000 Server, see Front-End and Back-End Server Topology Guide for Microsoft Exchange Server 2003 and Exchange 2000 Server.

The Microsoft Remote Connectivity Analyzer lacks sufficient documentation currently. To improve the documentation for each of the errors you might receive, we would like to solicit additional information from the community. Use the Community Content section to post more reasons why you failed at this point. If you need technical assistance, create a post in the appropriate Exchange TechNet forum or contact support.