Have you found a different method that works? Did the Online-Fix.me version work for you? Let the community know in the comments below (but please, no direct links to cracked files).
Sometimes, clearing your browser's cache and cookies can resolve issues with online games. This process varies by browser: gorebox online fix
What works
If you are trying to host a large game and nobody can join you, you may need to open specific ports on your router. While GoreBox often uses UPnP, manually forwarding UDP port 7777 Have you found a different method that works
While unofficial fixes can restore multiplayer, they come with risks: GoreBox on Steam gorebox online fix