Netplay - Issue connecting to other users

[WORLDPEACE]

Hello, I'm having a problem that I can not seem to find the solution for. I recently downloaded the dolphin emulator with intentions to play Super Smash Bros online with Netplay.

My problem is that whenever I get the ID code to join someones game a press join, it just takes a while then says disconnected.

The only information that I know about Netplay connection is that I should have my firewall off when I'm trying to connect which I do.

So if anyone knows what may be going on please let me know! Thanks

edit: I currently am using dolphin 4.0-652

[JMC47]

You're using the Dualcore Netplay branch, make sure you specify that next time!

Anyway, try disabling all of your firewalls and perhaps port forward (UDP and TCP) a port and force that in Options/Configuration under Netplay Listen Port and try hosting for someone else.