Multiplayer Not Working – Can’t Host or Join Any Game | Error 4301

[David Chou]

Hi Team and fellow players,

I want to report a serious issue I’ve been experiencing since purchasing Grounded 2.
Right from the beginning, I’ve been completely unable to host my own multiplayer game or join my friend’s server. Every time I try, I get this error:

CreateEndpoint: FailedToQueue: 4301
“There was an error hosting the multiplayer game. Please check your connection and try again.”

---

Things I’ve Tried (None Worked):

• Replugging my Ethernet cable

• Restarting PC and router

• Disabling firewall / antivirus

• Logging in and out of Xbox account

• Backing up and deleting local save files

• Enabling UPnP on my router

• Attempting port forwarding for UDP 3074, 3478-3479, 500, 3544, 4500

• Switching between Xbox and Steam versions (if applicable)

Despite trying all of the above, I still cannot join or host any multiplayer session. The issue persists, and I haven’t been able to play the game as intended.

---

Request:

Please investigate this issue — either on the server side, or in how save files or NAT connection is handled. A clear official explanation or fix is urgently needed.

Also, if anyone else has experienced this and found a solution, I would really appreciate any advice.

Thanks for your time.

[Luizmartinez1996]

Any fixes yet I'm having the same issue tried everything. It worked fine before the update too

[Tirayah]

Same here...

[Marvelous44087]

I can’t even get on the multiplayer server. Every time I try I get: “Multiplayer Connection Failure: There was an error connecting to the multiplayer service. Please check your connection and try again.” Literally tried everything mentioned in every Googled article and nothing.

[Yuqiwa]

For players who have this issue (CreateEndPoint: FailedToQueue: 4301) My issue was the same, I've tried several ways, updating my driver, my network, enable from NAT to Open. All does not work. End up the only solution that it works for me was, I was a LAN Cable user, switch your connection from LAN Ethernet > WiFI. I've tried this and it works! I can Host now or Join other players in the game.

P/S: But it is indeed weird that they disabled this options for LAN cable players, why just WiFi users can play the game?