Clients Can’t connect

If clients are unable to connect, you may have stale data in your servers Engine.ini file.

UE4 servers may have lines like this in their INI. This can cause the server to think it’s on a different version of the game then clients and will reject their attempts to connect. Delete the bUseBuildIdOverride and BuildIdOverride lines and that should resolve the issue.

[OnlineSubsystem]
bUseBuildIdOverride=True
BuildIdOverride=460304166

Server not registering in server browser

If your server has an ipv6 connection to the internet, it will try to register using it’s ipv6 address which is not supported.

We’re working on fixing this on the backend, but you can mitigate for the time being by disabling ipv6 on your server.

Server still not registering in server browser

We are rolling out some other fixes to the backend to retry more when registering servers. If you’re sure you are not registering over ipv6, this could be the issue.

Don’t rename mod pak files.

Also working on fixing this, but if you rename a mod pak file, it will fail to load.