Unremovable servers in Friends LAN Games

Same! I'm trying to reverse proxy a bedrock server (through nginx):

stream {
    server {
        listen 19132 udp;
        proxy_pass <EXTERNAL_IP>:19132;
    }
}

And I'm getting: "Unable to connect to world.".

I wish there are more logs available on the client side :/

I finally found out the solution to nginx reverse proxying a bedrock server! Since Bedrock servers run on RakNet, the session across the proxy must be kept. If you look at http://nginx.org/en/docs/stream/ngx_stream_proxy_module.html, you'll see that normally, every request becomes a new session. You don't want this. For the solution to work, you'll need to have NGINX version 1.15.7 and up (http://nginx.org/en/docs/stream/ngx_stream_proxy_module.html#proxy_requests)! Looking at the documentation for RakNet, in the worst case scenario, packets are sent every 10 milliseconds, eg 100 packets/requests are sent in 1 second (1000 milliseconds in 1 second). This means, that in order to keep the same session between the client and the user for one day, you'll need to hold a session for 8640000 packets/requests (100 packets/sec * 60 sec/min * 60 min/hr * 24 hr/day) (for one week, you'll need to accept 60480000 packets).

If you look at nginx's documentation on "proxy_requests":

 Sets the number of client datagrams at which binding between a client and existing UDP stream session is dropped. After receiving the specified number of datagrams, next datagram from the same client starts a new session. The session terminates when all client datagrams are transmitted to a proxied server and the expected number of responses is received, or when it reaches a timeout.

This means that you need to accept 8640000 datagrams for a session that lasts 1 day (the duration of the user staying in the game within a single session before they forcibly disconnect). In other words, the configuration of NGINX should be:

stream {
    server {
        listen 19132 udp;
        proxy_requests 8640000; # 100 * 60 * 60 * 24 -- session lasts for 1 day
        proxy_pass <IP_TO_MC_SERVER>:19132;
    }
}

With a load balancer:

stream {
    upstream balancer {
        server <IP_TO_MC_SERVER_1>:19132;
        server <IP_TO_MC_SERVER_2>:19132;
        server <IP_TO_MC_SERVER_3>:19132;
    }
    server {
        listen 19132 udp;
        proxy_requests 8640000; # 100 * 60 * 60 * 24 -- session lasts for 1 day
        proxy_pass balancer;
    }
}

Obviously, if you want to change the session time, just change proxy_requests. Remember that all communication is over UDP and that you need at least NGINX 1.15.7 for this to work. Cheers!

Is this still an issue in the latest version? If so, can you add it to the affected versions?

Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.

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