I’m trying to use Nginx to reverse proxy TFTP UDP port 69 traffic and I”m having a problem with getting files through the nginx reverse proxy.

My configuration is simple, I’m running TFTP on one Centos 6.x server and the Nginx reserve proxy on another Centos 6.x server with the latest Nginx mainline 1.11.10 from the nginx.org http://nginx.org/ repository.

TFTP connections to the TFTP server directly work. Using the same commands through the Nginx reverse proxy, connects, but will not download or upload a file through it.

If you have any suggestions, I’d appreciate a nudge in the right direction. I’m assuming it’s something I’m missing.

Eric Feldhusen

My configuration is below. The TFTP server is at 192.168.1.11 and the Nginx reverse proxy is at 192.168.1.145. No firewalls on either server.

stream {
upstream staging_tftp_servers {
server 192.168.1.70:69;
}

server {
listen 69 udp; #udp
proxy_pass staging_tftp_servers;
error_log /var/log/nginx/tftp.log info;
}
}

I’m seeing these in the tftp.log

2017/03/06 14:34:44 [info] 32676#32676: *554 udp upstream disconnected, bytes from/to client:36/0, bytes from/to upstream:0/36
2017/03/06 14:34:46 [info] 32676#32676: *556 udp upstream disconnected, bytes from/to client:36/0, bytes from/to upstream:0/36
2017/03/06 14:34:47 [info] 32676#32676: *1439 udp client 10.1.0.14:2277 connected to 0.0.0.0:69
2017/03/06 14:34:47 [info] 32676#32676: *1439 udp proxy 192.168.1.145:37961 connected to 192.168.1.11:69
2017/03/06 14:34:48 [info] 32676#32676: *558 udp upstream disconnected, bytes from/to client:23/0, bytes from/to upstream:0/23
2017/03/06 14:34:48 [info] 32676#32676: *560 udp upstream disconnected, bytes from/to client:36/0, bytes from/to upstream:0/36
2017/03/06 14:34:49 [info] 32676#32676: *1441 udp client 10.1.0.15:1090 connected to 0.0.0.0:69
2017/03/06 14:34:49 [info] 32676#32676: *1441 udp proxy 192.168.1.145:38526 connected to 192.168.1.11:69
2017/03/06 14:34:50 [info] 32676#32676: *562 udp upstream disconnected, bytes from/to client:36/0, bytes from/to upstream:0/36
2017/03/06 14:34:53 [info] 32676#32676: *1443 udp client 10.1.0.14:2277 connected to 0.0.0.0:69
2017/03/06 14:34:53 [info] 32676#32676: *1443 udp proxy 192.168.1.145:38689 connected to 192.168.1.11:69
2017/03/06 14:34:56 [info] 32676#32676: *564 udp upstream disconnected, bytes from/to client:23/0, bytes from/to upstream:0/23
2017/03/06 14:34:56 [info] 32676#32676: *566 udp upstream disconnected, bytes from/to client:36/0, bytes from/to upstream:0/36_______________________________________________
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