GameRanger uses specific ports for communication. Configure port forwarding on your router to allow incoming connections:
If you have a modem from your ISP connected to a personal Google or Netgear router, you might have a "Double NAT" issue. You’ll need to put the ISP modem into "Bridge Mode."
Click on the left. Click Change settings (you may need admin rights). gameranger firewall problem
Tech Retrospective Reading time: 5 minutes
The golden rule:
After each step, test properly:
Only do this temporarily for testing.
The most common cause is the built-in Windows Defender Firewall.
Verify that your network settings are correct: GameRanger uses specific ports for communication
This article explains exactly why this happens and provides a step-by-step guide to fixing it permanently.