"Communication was blocked..." error when you attempt to configure Microsoft Dynamics CRM for Microsoft Office Outlook

When you try to configure Microsoft Dynamics CRM for Microsoft Office Outlook, you receive the following error message:

“Communication was blocked, perhaps by your computer’s firewall settings, to a web service that is required by Microsoft Dynamics CRM.” 

Microsoft Dynamics CRM for Outlook was unable to communicate with the required services. This could be due to the client's machine blocking communication via proxy or proxy PAC file not allowing communication.
See the following links:

Unblock URLs required for Microsoft Dynamics CRM Online

Microsoft Dynamics CRM for Outlook client crashes when using a Proxy PAC file

(407) Proxy Authentication Required Exception

If you are still encountering issues connecting CRM for Outlook to your CRM Online organization, run the Microsoft Support and Recovery Assistant to diagnose and fix the problem.

More information
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.

Article ID: 2997744 - Last Review: 06/06/2016 22:47:00 - Revision: 3.0

Microsoft Dynamics CRM 2013, Microsoft CRM client for Microsoft Office Outlook, Microsoft Dynamics CRM 2015, Microsoft Dynamics CRM 2016

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