I have the same issue as him.
In Dolphin 4.0.2, I set the port, forward it and give my friend the IP address. Works, except that we get constant desyncs in Brawl.
In the DC-Netplay branch 4.0-652 it seems to have a new Netplay menu which gives a random port, ok fine I forwarded every single port for this and gave my friend my details in the style of IP
ORT.
He gets the "disconnected" message, neither does the ID method work. Though now if I give him my Hamachi IPORT instead he can connect, we played for 4 hours with no desyncs but we have to suffer the added latency of hamachi.
In Dolphin 4.0.2, I set the port, forward it and give my friend the IP address. Works, except that we get constant desyncs in Brawl.
In the DC-Netplay branch 4.0-652 it seems to have a new Netplay menu which gives a random port, ok fine I forwarded every single port for this and gave my friend my details in the style of IP
ORT.He gets the "disconnected" message, neither does the ID method work. Though now if I give him my Hamachi IP
ORT instead he can connect, we played for 4 hours with no desyncs but we have to suffer the added latency of hamachi.