To configure the TeamViewer firewall whitelist on Windows, follow these steps:
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. teamviewer firewall whitelist
This is TeamViewer’s proprietary port. It is vastly preferred over 443 for raw data transfer. If 5938 is blocked, TeamViewer tries 443, but performance may degrade. To configure the TeamViewer firewall whitelist on Windows,