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"The remote server returned an error: (407) Proxy Authentication Required" error in Microsoft Dynamics CRM

Knowledge Article Number 000213043
When you enter the API Username credentials during the Proxy Setup, the following error is produced:

"The remote server returned an error: (407) Proxy Authentication Required."
Please work directly with your IT department to resolve this issue and provide them with the following steps: 

1. Enable ports 80 and 443 on your firewall. 

This will allow communication with the Marketing Cloud application via the Microsoft Dynamics CRM Integration. Port 80 allows for standard http traffic, and port 443 allows for secure https traffic.
2. Allow your Microsoft Dynamics CRM server IP to pass through your Proxy Server without authenticating.
  • Put the server into the authentication rule set on the Proxy Server to allow all traffic from the server to pass.
  • Put a set of rules in the access tables to allow your Microsoft Dynamics CRM IP addresses to access websites.
  • Bypass the authentication parameter as well as the access parameter of the Proxy Server.


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