Permanent solution, check default guide to your router in http://www.portforward.com
and follow the instructions to open 4321 UDP port. Don't download any software it asks you to.
Or use hamachi if you're hosting in the meantime
Tour issues by PM or Discord
If you don't send me a PM or DM, you might see your chances reduced. Inform me about anything that might have gone on with your matches BEFORE deadlines, otherwise, decisions won't be changed.