GOG - Steam crossplay NATpunch (66) error

[Excellent!-Esa]

Hello,

Tried playing with my friend for hours and he can't see any active games on his lobby (GOG side, might be normal) when I see loads of lobbies (steam). We tried using direct connect but he doesn't see the checkboxes next to the direct connect nor lan options. I see them normally and I can try to direct connect to him but I get an error NATpunch (66).

We have tried using Hamachi for LAN play but can't find each other's games.

The problem is probably with his internet or network options. He tried turning firewall off alltogether to no avail. We also tried using another internet through mobile (which shouldn't have NAT?) and get the same error.

Setting Larilauncher and BG3.exe + BG3DX11.exe to administrator didn't do anything.

It's probably something to do with router NAT and opening ports, any idea what ports to open TCP/UDP? Is there's anything else that we can try?

[jaimearosemena]

Hello. I have exactly the same problem and no solutions to be found on the web.

[Micsheppy]

Same issue. GoG + Steam does not work.

[アンジェル]

Originally posted by Excellent!-Esa:

GOG - Steam crossplay NATpunch (66) error
Hello,

Tried playing with my friend for hours and he can't see any active games on his lobby (GOG side, might be normal) when I see loads of lobbies (steam). We tried using direct connect but he doesn't see the checkboxes next to the direct connect nor lan options. I see them normally and I can try to direct connect to him but I get an error NATpunch (66).

We have tried using Hamachi for LAN play but can't find each other's games.

The problem is probably with his internet or network options. He tried turning firewall off alltogether to no avail. We also tried using another internet through mobile (which shouldn't have NAT?) and get the same error.

Setting Larilauncher and BG3.exe + BG3DX11.exe to administrator didn't do anything.

It's probably something to do with router NAT and opening ports, any idea what ports to open TCP/UDP? Is there's anything else that we can try?

Originally posted by jaimearosemena:

Hello. I have exactly the same problem and no solutions to be found on the web.

Originally posted by Micsheppy:

Same issue. GoG + Steam does not work.

Could you ask them if they have the Behir Blue Die skin?

Also, that sounds definitely like a router/firewall issue. I am surprised it failed with Hamachi as well.

Try resetting your network adapters. To do this, click Start or if using Win 10 click Search. Next type ‘cmd’ into the search box, then click Command Prompt and select run as administrator. Type ’netsh winsock reset’ and hit enter. When that is done, there should be a message 'Winsock reset completed successfully'. At that point, type ‘exit’, hit enter and reboot your computer.

If applicable, in your routers try enabling UPnP. Check if there is a DMZ function, or any NAT settings you can adjust. Whoever is hosting can try setting up port forwarding in their router to connect to the PC (ports 23253-23262 and 23243-23252).

After a few times you need to apply this
https://steamcommunity.com/sharedfiles/filedetails/?id=3018203217

There is currently an issue with PlayerProfiles which can prevent connections. Make sure both of you do as instructed before trying it again, okay?

And let me know if they have the Behir Blue Die skin as well ~ here is an image how you can find it ingame: https://steamuserimages-a.akamaihd.net/ugc/2008095100962684822/900521D87ADB90BC205E56394703848104E038A8/

[kommie]

I have the same error and posted what I tried here: https://steamcommunity.com/app/1086940/discussions/0/3819669605972139830/

[Groseille]

For those having this error in multiplayer and playing cross steam and gog, I hope this helps:

There were 3 of us on STEAM and one on GOG, impossible to play together in direct connection with NATpunch error. We finally succeeded by doing this:

- Player 1 on STEAM uses Direct Connect and sends the code ONLY to Player 2 on GOG

- ONLY AFTER player 2 joins the lobby, player 1 on Steam sends an invitation WITH STEAM (no code) to player 3 and player 4

So far so good doing it this way