When a friend of mine tries to join, this error appears in the server log:
[2026.04.15-16.10.40:508][123]LogNet: Error: UEngine::BroadcastNetworkFailure: FailureType = ConnectionLost, ErrorString = UIpNetConnection::HandleSocketSendResult: Socket->SendTo failed with error 33 (SE_ECONNREFUSED). [UNetConnection] RemoteAddr: R5:a3c3fece3b9a41859674f661816a25a6:, Name: IpConnection_2147340316, Driver: Name:GameNetDriver Def:GameNetDriver R5NetDriver_2147480933, IsServer: YES, PC: NULL, Owner: NULL, UniqueId: NULL:DESKTOP-51NOHOR-F971E5EC4B964FE378A895A57B2DAC8F Connection will be closed during next Tick()!, Driver = Name:GameNetDriver Def:GameNetDriver R5NetDriver_2147480933
This error has only happened to one friend so far, while others are able to do it. What could be the cause?