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I'm experiencing 502 gateway errors when accessing a PHP file in a directory (http://domain.com/dev/index.php), the logs simply says this:

2011/09/30 23:47:54 [error] 31160#0: *35 connect() failed (111: Connection refused) while connecting to upstream, client: xx.xx.xx.xx, server: domain.com, request: "GET /dev/ HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "domain.com"

I've never experienced this before, how do I do a solution for this type of 502 gateway error?

This is the nginx.conf:

user www-data;
worker_processes 4;
pid /var/run/nginx.pid;

events {
    worker_connections 768;
    # multi_accept on;
}

http {

    ##
    # Basic Settings
    ##

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    # server_tokens off;

    # server_names_hash_bucket_size 64;
    # server_name_in_redirect off;

    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    ##
    # Logging Settings
    ##

    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    ##
    # Gzip Settings
    ##

    gzip on;
    gzip_disable "msie6";

    # gzip_vary on;
    # gzip_proxied any;
    # gzip_comp_level 6;
    # gzip_buffers 16 8k;
    # gzip_http_version 1.1;
    # gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;

    ##
    # Virtual Host Configs
    ##

    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;
}


#mail {
#   # See sample authentication script at:
#   # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
# 
#   # auth_http localhost/auth.php;
#   # pop3_capabilities "TOP" "USER";
#   # imap_capabilities "IMAP4rev1" "UIDPLUS";
# 
#   server {
#       listen     localhost:110;
#       protocol   pop3;
#       proxy      on;
#   }
# 
#   server {
#       listen     localhost:143;
#       protocol   imap;
#       proxy      on;
#   }
#}
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What does nginx.conf look like? –  quanta Oct 1 '11 at 1:43
1  
'Connection refused' means that backend does not listen to the port 9000 or its queue is filled up. This problem is related to the backend itsef. Are you able to telnet localhost 9000? You should also check your backend and php logs. –  Andrew Oct 1 '11 at 9:17
    
Updated my post. I could not telnet to localhost 9000. –  Burning the Codeigniter Oct 1 '11 at 10:48
    
I have the same issue going on. Except I'm using RAILS, so do I still need php-fpm? –  Shamoon Oct 26 '12 at 15:10
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2 Answers

up vote 12 down vote accepted

It sounds like you haven't started and configured backend for Nginx. Start php-fpm and add the following to nginx.conf, in http context:

server {
    listen 127.0.0.1;
    server_name localhost;

    error_log /var/log/nginx/localhost.error_log info;

    root /var/www/localhost/htdocs;

    location ~ \.php$ {
        fastcgi_pass 127.0.0.1:9000;
        include /etc/nginx/conf.d/*.conf;
        include /etc/nginx/sites-enabled/*;

        fastcgi_intercept_errors        on;
        error_page 404 /error/404.php;
    }
}
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Thanks man, it worked, I didn't have php-fpm installed. Cheers. –  Burning the Codeigniter Oct 1 '11 at 11:21
    
You're pure genius. I can't believe 1.0000000 million guides I read about this, NOBODY mentions that you must put a "listen 127.0.0.1" to enable backend. You saved me from a nightmare!!! –  user145046 Nov 11 '12 at 19:39
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This answer only for those, who get error like

connect() failed (111: Connection refused) while connecting to upstream, client .... fastcgi://[::1]:9000

and come from second link in google search =)

Rewrite your nginx config to use ip, not dns (like 127.0.0.1 instead 'localhost') or remove ipv6 alias from /etc/hosts.

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