MC1387814 Medium
(Updated) Microsoft Teams: RTMP-In port and domain changes required
Summary AI-generated
Teams is updating port and domain requirements for RTMP-In to improve streaming reliability and scalability. Admins must update network access to avoid failures after December 31, 2026.
Suggested actions AI-generated
- Review firewall and network configuration
- Allow outbound access to ports 50118 and 50119 (RTMP/RTMPS)
- Allow outbound access to domain *.rtmpingest.mcr.teams.cloud.microsoft
- Validate connectivity with Microsoft 365 endpoint guidance
- Inform networking and IT teams
- Update internal documentation for RTMP-In streaming
Written by Azure OpenAI (gpt-4.1) from the text of the post below. It can be incomplete or wrong; the original post is authoritative.
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Original post from Microsoft
Updated September 4, 2026: We have updated the content; the release of this required change is still paused at this time. We will announce via Message center when we are ready to proceed. We apologize for any inconvenience.
[What and Why]
Microsoft Teams is updating the port and domain requirements for Real-Time Messaging Protocol (RTMP)-In, which enables organizers to stream content into meetings, webinars, and town halls using external hardware or software encoders. This change improves reliability and scalability for Teams streaming scenarios.
[Rollout Schedule]
- General Availability (Worldwide): We will announce via Message center when we are ready to proceed.
[Impact on Your Organization]
Who is affected
- Admins managing Microsoft Teams meetings, webinars, and town halls
- Event organizers who use RTMP-In with external encoders
Platforms/Services
- Microsoft Teams (meetings, webinars, and town halls)
What will happen
- New meetings, webinars, and town halls that use RTMP-In will require updated network access.
- Admins must allow the required ports and domain endpoints for RTMP-In streaming.
- Existing meetings, webinars, and town halls already configured with RTMP-In will continue to function through the end of 2026.
- RTMP-In continues to allow organizers to stream content into Teams from external hardware or software encoders.
- Without these updates, organizers may be unable to create or stream RTMP-In events, and newly created events may fail after December 31, 2026.
Required network endpoints:
- Ports: 50118 and 50119 (RTMP/RTMPS)
- Domain: *.rtmpingest.mcr.teams.cloud.microsoft
[Action Required/Recommendations]
Action required by January 31, 2027.
- Review your organization’s firewall and network configuration.
- Allow outbound access to:
- Ports 50118 and 50119 (RTMP/RTMPS)
- Domain: *.rtmpingest.mcr.teams.cloud.microsoft
- Validate connectivity against official Microsoft 365 endpoint and firewall guidance.
- Communicate this change to your networking and IT teams.
- Update internal documentation if you support RTMP-In streaming scenarios.
Learn more: Manage RTMP-In for Teams meetings, webinars, and town halls | Microsoft Teams | Microsoft Learn
[Compliance considerations]
No compliance considerations identified. Review as appropriate for your organization.
Additional details from Microsoft
- Summary
- Microsoft Teams is updating RTMP-In port and domain requirements to improve streaming reliability. Admins must allow outbound access to ports 50118, 50119, and domain *.rtmpingest.mcr.teams.cloud.microsoft by January 31, 2027. Existing RTMP-In events work until end of 2026; new events require updates to avoid failure.