502 Bad Gateway error for my server running with Node JS on nginx proxy
express, nginx, node.js
Solution
502 errors are generally caused by NGINX being unable to pass a request to "upstream", in this case your Node.js server (which is also what the error message suggests: "Connection refused"").
It may be crashing and restarting, so check its logfiles to see what's causing the crashes.
Problem
I am getting 502 bad gateway error: when I check the nginx error log I find this: 2017/05/06 02:36:04 [error] 48176#0: *135 connect() failed (111: Connection refused) while connecting to upstream, client: 10.163.XX.X, server: abc-def-ghi, request: "GET /favicon.ico HTTP/1.1", upstream: "https://127.0.0.1:5300/favicon.ico", host: "hostnname", referrer: "hostname-1 I searched internet enough but could not find anything. One thing to note here is that, this intermittent error is coming only on a particular page. Could this be a code issue? or nginx configuration issue> Can anyone please help me here. Some of my nginx conf: ``` upstream node_api_server { server localhost:5300 fail_timeout=0; } location / { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_set_header Host $http_host; proxy_set_header X-NginX-Proxy true; proxy_read_timeout 5m; proxy_connect_timeout 5m; proxy_pass_header Set-Cookie; proxy_pass https://node_api_server; proxy_redirect off; proxy_buffer_size 128k; proxy_buffers 4 256k; proxy_busy_buffers_size 256k; break; } ```