Port won't open no matter what

Posted August 18, 2017 3.3k views
NginxFirewallUbuntu 16.04

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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1 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