Article ID: 2710604 - View products that this article applies to.
Note This article only applies to Office 365 customers who have a hybrid deployment of on-premises Exchange Server and Exchange Online.
You try to use the Microsoft Remote Connectivity Analyzer tool to send an HTTP request to test the authentication methods of the specified service in Office 365 or in the Exchange hybrid server. If a 401 unauthorized response is received, the Remote Connectivity Analyzer tool expects certain WWW-Authenticate headers in the response. Certain services, such as Microsoft Exchange ActiveSync and Outlook Anywhere (formerly known as RPC over HTTP), don't negotiate an authentication method with the remote server. These clients have a predefined authentication method that's sent with each request. If this authentication method isn't enabled on the remote server, you get the following error message from the Remote Connectivity Analyzer tool:
Additionally, if the predefined authentication method isn't enabled on the remote server, users may experience the following issues:
All Required Authentication Methods could not be found.
To resolve this issue, follow these steps, as appropriate for your situation:
Review the following documentation and confirm that the correct authentication methods for each application or service are enabled for the virtual directories on your Microsoft Exchange Server:
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