In a port forwarding rule, the incoming interface is not correctly selected.
Or with the nmap utility, which is designed for versatile, customizable scanning of IP networks.īelow are typical reasons that can lead to the inoperability of port forwarding, despite the correct configuration.ġ. TIP: Tip: You can use special Internet services designed to check the openness of ports-for example,, , etc. For example, if the FTP server is not started and even if there is a NAT rule for port forwarding, the port status will be 'closed' during the check. The service or application to which port forwarding is performed must be started so that the port can be seen as 'open' during the check. Port forwarding will not work when accessing from the local network.ģ.
To check whether port forwarding is working, you must access the router's WAN interface from the Internet. If the router's WAN interface uses an IP address from a private subnet, port forwarding will not work.Ģ. When setting up port forwarding, it is necessary to have a public IP address on the router's WAN interface through which it connects to the Internet.
