Question

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. ???


Submit an answer


This textbox defaults to using Markdown to format your answer.

You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

Sign In or Sign Up to Answer

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

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

nmap -p PORTNUMBER -sU -P0 YOURIP

Try DigitalOcean for free

Click below to sign up and get $200 of credit to try our products over 60 days!

Sign up

Become a contributor for community

Get paid to write technical tutorials and select a tech-focused charity to receive a matching donation.

DigitalOcean Documentation

Full documentation for every DigitalOcean product.

Resources for startups and SMBs

The Wave has everything you need to know about building a business, from raising funding to marketing your product.

Get our newsletter

Stay up to date by signing up for DigitalOcean’s Infrastructure as a Newsletter.

New accounts only. By submitting your email you agree to our Privacy Policy

The developer cloud

Scale up as you grow — whether you're running one virtual machine or ten thousand.

Get started for free

Sign up and get $200 in credit for your first 60 days with DigitalOcean.*

*This promotional offer applies to new accounts only.