UDP Nginx proxy timeout issue (Shared connection busy)

healpimp

2/2/24, 8:55 PM

I have setup a TCP/UDP proxy with nginx on multiple servers. Nginx is struggling to handle some client which causes timeouts for the users.

Here is the proxy setup

stream {
    upstream backend {
        server serverip:[my port];
    }

    server {
        listen [my port] udp reuseport;
        proxy_pass backend;
    }
}

I've allowed 10,000 workers connections in the nginx config, but I don't believe it to be a load issue as only 20-50 clients are connected per proxies.

Despite increasing the amount of workers connections, i'm getting this warning from error.log which happens at the same time as UDP timeouts:

[alert] 33872#33872: *13240 shared connection is busy while proxying and sending to client, udp client: [client ip], server: 0.0.0.0:[my port], upstream: "server ip", bytes from/to client:7433/297881, bytes from/to upstream:297905/7433
[alert] 33872#33872: *5529 shared connection is busy while proxying and sending to client, udp client: [client ip], server: 0.0.0.0:[my port], upstream: "server ip", bytes from/to client:1499651/7037337, bytes from/to upstream:7037361/1499651

319

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nginx

reverse-proxy

udp

Elon Musk

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EN: UDP Nginx proxy timeout issue (Shared connection busy)

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