Port Forwarding Troubleshooting - DD-WRT Wiki
wiki.dd-wrt.com › wiki › indexTo test a single TCP and UDP port number with Nmap, use the following options: nmap -sT -sU -p [port] [IP Address] Go to the Security -> Firewall page in the GUI. Uncheck Filter WAN NAT Redirection (it is by default) which means loopback will be allowed. If you disabled the SPI firewall then you will have to enable it temporarily to be able to ...