It has come to our attention that recently people who had UPnP enabled have had their settings unintentionally revoked by the most recent client update.
If you’re experciencing issues, please make sure you’ve enabled the following tickbox in your client (In the menu bar, select Options->Settings->Game port):
We’re working on implementing industry standard connectivity protocols for the game (ICE/TURN), which means a lot more people should be able to connect without proxy and faster in the future. Stay tuned for updates on this 🙂
– Sheeo