Starting networking diagnostics...

Your local network port (UDP) is 16000. All game traffic is routed through this port. This can be changed in "Settings" -> "NAT Traversal".

Attempting to connect to 3 test servers. This will take around a minute to complete...

Received data from 'server 2' through port 16000 (this is your WAN or router port)
Received data from 'server 1' through port 16000 (this is your WAN or router port)
Received data from 'server 3' through port 16000 (this is your WAN or router port)
14 seconds left.
9 seconds left.
4 seconds left.

Test Result: All Pass
Network Health: All tests passed
Recommended Action: None
Details: All tests passed.

For help understanding this report or for more information go to http://www.voobly.com/pages/view/177#Network_Diagnostic_Tool.

From your post it seems that your NAT port is already open. In other words, you probably do not need port forwarding, or you already have it setup.

So what exactly is the issue you are facing? Please consider detailing your concern so that we are able to assist you better.

Thank you