How to check if a port is forwarded properly?

[Jango40]

I want to test if the 7777 port works properly, or if I'm having a different problem entirely.

[Futuza]

Receiving or sending through the port?

 

This is a pretty good external service to see if the specified IP has open ports or not: http://www.canyouseeme.org/

In windows you can check currently active ports by opening the resource monitor (open task manager -> performance tab -> Open Resource Monitor -> network tab -> tcp connections and listening ports

[Raz0r]

In windows you can check currently active ports by opening the resource monitor

Sounds like that will only show which processes are listening on ports, not able to show if there are any firewalls or routers allowing traffic from the interwebs.

Linux equivalent would be: netstat -ntulp

[Futuza]

Sounds like that will only show which processes are listening on ports, not able to show if there are any firewalls or routers allowing traffic from the interwebs.

Linux equivalent would be: netstat -ntulp

You can see if there's packets actually being sent/received and associated latency which would tell you if it's working.

 

If that's still not enough you could always grab wireshark...