Teamviewer Firewall Whitelist //free\\ May 2026

If you run a corporate network, use a hardware firewall (like SonicWall or Fortinet), or have aggressive antivirus software, you need to whitelist TeamViewer. You cannot simply rely on UPnP (Universal Plug and Play) or hope the traffic slips through.

In 90% of cases, the culprit is a strict firewall. teamviewer firewall whitelist

| Protocol | Port(s) | Destination | Purpose | | :--- | :--- | :--- | :--- | | TCP | 443 | *.teamviewer.com | Web login & authentication | | TCP | 5938 | *.teamviewer.com | Primary data channel | | TCP | 80 & 443 | master.teamviewer.com | Fallback & master routing | If you run a corporate network, use a

Whitelisting means telling your firewall: "Do not inspect, block, or question traffic coming from TeamViewer’s official servers. Let it pass immediately." | Protocol | Port(s) | Destination | Purpose