node.js - socket io with node js is not connecting through nginx proxy_pass -

the issue when use nginx socket not establishing.any 1 me in steps follow integrate socket oi nginx. tried this

location /field  {           # following required websockets         proxy_set_header x-real-ip $remote_addr;         proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for;         proxy_set_header host $http_host;         proxy_set_header x-nginx-proxy true;          # supposedly prevents 502 bad gateway error;         # not necessary in case         proxy_buffers 8 32k;         proxy_buffer_size 64k;          # following required         proxy_pass            proxy_redirect off;          # following required websockets         proxy_http_version 1.1;         proxy_set_header upgrade $http_upgrade;         proxy_set_header connection "upgrade";          tcp_nodelay on; # not necessary               } 

first of check nginx version. according page websockets supported after v1.3.13;

http://nginx.com/blog/nginx-nodejs-websockets-socketio/

then compare nginx conf below configuration stated in nginx blog;

map $http_upgrade $connection_upgrade {     default upgrade;     '' close; }  upstream websocket {     server 192.168.100.10:8010; }  server {     listen 8020;     location / {         proxy_pass http://websocket;         proxy_http_version 1.1;         proxy_set_header upgrade $http_upgrade;         proxy_set_header connection $connection_upgrade;     } } 

http://nginx.com/blog/websocket-nginx/

also check firewall configuration port chose socket.io server. (i've read isps blocking websocket connection ports other 80 & 443, please check if server receive packets using tcpdump etc.)

if everyhing okay until now, check nginx error logs (/var/log/nginx/error.log) see if there socket.io related error messages. can paste here further analysis.

then if there no socket error in nginx logs start node app debug mode on below;

debug=* node yourfile.js 

and check if socket connection message printed console. can paste further analysis.