Port won't open no matter what

I tried it all, firewall port is opened OUT as well. netstat -plunt shows that the app IS LISTENING ON THE PORT no additional external firewall was ever setup.

the app is located in /var/natholepunch/Nat.exe

app is launched through mono ..

app is running. It is listening. Port is opened in firewall.

Port is still closed. ???

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Accepted Answer

Its because the .exe i was running is listening to UDP so ALL of the port checkers online and default nmap port check will simply report it as closed you need to perform udp check