Why is my port filtered?

Port checker

Can the internet reach this port?

Tested from around the worldPlain English + technicalFree, no sign-upports.middle.network

Open: something is listening. Closed: the host said no. Filtered: a firewall gave no answer.

The health check runs this and 30 more checks on a domain, then ranks what to fix.

Firewalls, switches and Wi-Fi bundled for homes and offices.

Check whether TCP ports on a host are open, closed or blocked by a firewall, from our servers on the internet.

Every result comes in two styles: plain English for everyone, and the exact technical detail for engineers, with the raw JSON one click away.

A firewall or router is dropping the traffic. Check port forwarding and the host firewall.