Teamviewer Blocked By Firewall Jun 2026

To avoid firewall-related issues with TeamViewer:

Which ports and IP ranges need to be whitelisted for TeamViewer to work through a strict firewall? We use allowlist-only outbound rules. teamviewer blocked by firewall

If 5938 is blocked, TeamViewer tries 443 (HTTPS). Port 80 (TCP): The final fallback port. teamviewer blocked by firewall