Communication was blocked error when you attempt to configure Microsoft Dynamics CRM for Microsoft Office Outlook
This article provides a solution to an error that occurs when you try to configure Microsoft Dynamics CRM for Microsoft Office Outlook.
Applies to: Microsoft Dynamics CRM 2013, Microsoft CRM client for Microsoft Office Outlook, Microsoft Dynamics CRM 2015, Microsoft Dynamics CRM 2016
Original KB number: 2997744
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. It could be because of the client's machine blocking communication via proxy or proxy PAC file not allowing communication.
See the following link:
Solution | CRM 2013 Outlook Client – (407) Proxy Authentication Required Exception
If you're still meeting issues connecting CRM for Outlook to your CRM Online organization, run the Microsoft Support and Recovery Assistant to diagnose and fix the problem.