If you have forwarded ports but still face issues:
netsh interface teredo show state
After that, verify with netsh int teredo show state (Admin CMD). Look for Type: client and State: qualified . teredo port forwarding
| Issue | Probable Cause | Solution | | :--- | :--- | :--- | | | No connectivity to Teredo Server. | Check internet connection. Try netsh interface teredo set state servername=teredo.remlab.net . | | Status: Qualified but no connectivity | DNS issues or Relay failure. | Check if you can ping ipv6.google.com. | | Error: The system cannot find the file specified | Teredo driver issue. | In Device Manager, show hidden devices, uninstall "Teredo Tunneling Pseudo-Interface," and scan for hardware changes. | | Still Strict NAT | Double NAT (ISP Modem + Router). | Bridge the ISP modem or forward ports on the ISP modem to your router, then your router to the device. | If you have forwarded ports but still face