Article ID: 2710606 - View products that this article applies to.
Note The following scenario only applies to Microsoft Office 365 customers who have a hybrid deployment of on-premises Exchange Server and Exchange Online.
When you use the Microsoft Remote Connectivity Analyzer tool to test the Outlook Anywhere feature in a Microsoft Office 365 environment, the tool displays the following error message:
Additionally, a user may experience the following symptoms:
Mutual Authentication could not be established.
This issue occurs if one or more of the following conditions are true:
To resolve this issue, follow these steps:
The Remote Connectivity Analyzer tool negotiates a Secure Sockets Layer (SSL) connection to the remote host to retrieve various properties on X509 certificates. The tool evaluates the Subject attribute to identify the FQDN or common name that was assigned to the certificate (for example, mail.contoso.com).
For more information about the principal names, go to the following Microsoft Developer Network (MSDN) website:
Principal NamesFor more information about Exchange 2010 and Exchange 2007 Outlook providers, go to the following Microsoft websites:
The Autodiscover Service and Outlook Providers
Still need help? Go to the Office 365 Community