Linux Multiplayer Requires IPv6 Enabled

[Dal Shooth]

I had an issue with my Linux Pop_OS install where I couldn't join any multiplayer servers. The error that was displayed was highly cryptic, just as much as the solution was. I also had a hard time finding info online about the issue and it wasn't until I looked at other survival games did I found a solution.

Error

You were disconnected from this server

Could not initiate connection. Error: System.Net.Sockets.SocketExpception (0x800040005): An address incompatible with the requested protocol was used at System.Net.Sockets.AddressFamily addressFamily, System.Net.Sockets.SocketType dockerType, System>Net.Sockets.ProtocolType protocolType) [0x00070] in :0

Fix

https://steamcommunity.com/app/251570/discussions/1/1744512496197531395/

Thanks. I've had ipv6.disable=1 in my grub config for years. Removed it and A18 works now. Had to do the same thing to get the server to run. Sucks because that means managing two firewalls - one for ipv4 and one for ipv6. I have ipv6 setup to allow lo interface on INPUT but then reject everything else. Default drop on FORWARD and INPUT chains. Guess that's not so bad. 

Suggestion

I would like to see the devs disable by default the use of IPv6 to help protect the network illiterate individuals. Using IPv6 should only be used as needed for special cases.

https://nira.com/ipv6-security-risks/

Edited January 16, 2023 by Dal Shooth

[Dal Shooth]

For those of you that have disabled IPv6 through your boot loader, but need to enable it to play Vintage Story. You can still go to the network adapter and disable IPv6 at the network level. I was still able to join servers after disabling on the network adapter.

[ArrayPointer]

I have IPv6 disabled on my entire Linux-based home network, and that hasn't negatively affected Vintage Story local or remote players. Until recently I ran a Mint server with Mono, if that is helpful to know. I don't know if this applies to your situation, but when I initially started a VS Internet server, we had problems with a couple of remote players until they used a VPN. The conclusion we derived from this experience is that there's something about the initial handshake between client and server that some ISPs don't like.

Regards,

ArrayPointer