Share via

Networking requirements

  • Article

Microsoft eCDN setup has some networking requirements mainly in the following areas.

  1. When a user browses to the event page, the client needs to download the Microsoft eCDN script - that requires an https connection to *.ecdn.teams.microsoft.com.

  2. Once downloaded, it creates a secure WebSocket connection to our backend.

  3. The peer-to-peer connection itself is a UDP connection over the port range 1025-65535, chosen randomly by the browser. Chromium browsers such as Microsoft Edge and Google Chrome allow the port range to be configured using the WebRtcUdpPortRange policy.

External connections  

Connections that go out to the internet. Usually packets in these connections go through the firewall and need allow-listing.

Hostname  Ports Protocol Description 
*.ecdn.teams.microsoft.com 443  HTTPS over TCP Microsoft eCDN scripts 
*.ecdn.teams.microsoft.com 443  WebSocket over TCP Microsoft eCDN backend 

Note

July 20, 2023, we completed transitioning domains from *.ecdn.microsoft.com to *.ecdn.teams.microsoft.com. We ask customers to ensure the addition of the new domain to any firewall, proxy, VPN or mDNS configurations they may have made.

Internal connections  

Connections that remain inside the corporate network. Usually packets in these connections don't go through a firewall and wouldn't need any configuration to allow them.

Hostname  Ports Protocol Description 
n/a 1025-65535 SCTP over DTLS over UDP P2P communication