Teamviewer Firewall Today

TeamViewer uses Port 5938 for the vast majority of its traffic. It is the fastest and most stable way for the software to communicate.

Sometimes, the firewall built into your antivirus (like Norton or McAfee) conflicts with the Windows Firewall. Ensure both have the same rules applied. teamviewer firewall

access-list OUTBOUND extended permit tcp any object-group TeamViewer_Servers eq 5938 But since IPs change, use (if ASA version 9.5+): TeamViewer uses Port 5938 for the vast majority

TeamViewer setup usually adds rules automatically. To verify or manually add: teamviewer firewall