I am trying to test whether I can get to a particular port on a remote server (both of which I have access to) through UDP.

Both servers are internet facing. I am using netcat to have a certain port listening.

I then use nmap to check for that port to see if it is open, but it doesn't appear to be.

Iptables is turned off.

Any suggestions why this could be? I am eventually going to setup a VPN tunnel, but because I'm very new to tunnels, I want to make sure I have connectivity on port UDP 1194 before advancing.