Question

Port won't open no matter what

Posted August 18, 2017 1.9k 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

nmap -p PORTNUMBER -sU -P0 YOURIP

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