Microsoft Teams: RTMP-In port and domain changes required

🚨 The Signal: Microsoft Teams is updating network port and domain requirements for RTMP-In streaming. Admins must update firewall rules to allow new ports 50118/50119 and domain *.rtmpingest.mcr.teams.cloud.microsoft by mid-July 2026 to maintain streaming functionality.

The Impact

Network administrators are affected, with a low security risk if network changes are managed securely.

• Network administrators: Must update firewall rules for Teams RTMP-In.
• Event organizers: May experience streaming failures if network changes are not applied.
• Security teams: Need to validate new network endpoints against security policies.

The Action

1. Identify all network devices (firewalls, proxies) that control outbound traffic for Microsoft Teams.
2. By mid-July 2026, configure network devices to allow outbound TCP traffic on ports 50118 and 50119.
3. By mid-July 2026, configure network devices to allow outbound traffic to the domain *.rtmpingest.mcr.teams.cloud.microsoft.

Domain: Teams · Impact: low · Workload: Teams