Troubleshooting
Most router and port problems repeat the same root causes.
RouterWiz should help users identify whether the failure is local, inside the router, or upstream at the ISP layer. The real value is getting to the right layer quickly.
Typical local issues
- The app is not listening on the expected port.
- The target device IP changed after DHCP renewal.
- Windows Firewall or another endpoint firewall is blocking traffic.
Typical upstream issues
- Double NAT between ISP gateway and personal router.
- CGNAT with no true public IPv4 path.
- ISP restrictions or provider-managed router settings.
Port Forwarding Not Working
The port still looks closed even after saving rules in your router.
Open guide
Double NAT
Two routers, an ISP gateway, or mesh/router combinations can block inbound access.
Open guide
CGNAT
Your ISP may not be giving you a truly public IPv4 address for inbound traffic.
Open guide