Fix “502 Bad Gateway” error on NGINX with PHP, ISPConfig, and WordPress

The Error

I recently added a new site through ISPConfig and I was receiving 502 Bad Gateway errors when trying to access a WordPress install I was trying to set up.

Diagnosis

This error is due to the PHP endpoint not existing when the server tries to access it.

I noticed that the web .sock in /var/lib/php5-fpm was missing for the new site.
As well as the process missing when running: ps aux | grep php

Troubleshooting

Running any of the following recommended commands did not help

  • service php5-fpm stop
  • service php5-fpm start
  • service php5-fpm restart
  • service nginx restart

It threw back the following message to me: stop: Unknown instance:

The Fix

What ended up working for me was to run: sudo pkill php5-fpm; sudo service php5-fpm start

Resources

Here are the sites and articles I came across that helped

  • http://jvdc.me/fix-502-bad-gateway-error-on-nginx-server-after-upgrading-php/#comment-3754
  • http://serverfault.com/questions/189940/how-do-you-restart-php-fpm

 

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One Comment

  1. Cody Swartz Peter O.
    Posted December 3, 2016 at 11:53 am | Permalink

    Hi Cody, I’ve been looking for a recent article or post on the 502 Error with ISPconfig, Nginx and WordPress. I just rebooted my server, before reading your post. I’ve been getting this error sometimes, and a “database cannot connect” (most often shown as Error 500 – Internal Server Error) error at other times, once or twice per day. A reboot via by SSH client is a band-aid fix. Will try your suggested fix next time (later today likely). I’m not experienced with Linux, so finding a setup that mirrors mine, in your post, is cause for hope.

    My second issue with this ISPconfig 3.1.x is that I’ve never been able to get a Filezilla FTP client to connect successfully. If you have a moment, can you suggest how I might diagnose this?

    Here’s output from https://testfpt.net
    Test log
    Status: Resolving address of *.**.com
    Status: Connecting to 209.**.**.**
    Warning: The entered address does not resolve to an IPv6 address.
    Status: Connected, waiting for welcome message…
    Reply: 220———- Welcome to Pure-FTPd [privsep] [TLS] ———-
    Reply: 220-You are user number 1 of 50 allowed.
    Reply: 220-Local time is now 01:23. Server port: 21.
    Reply: 220-This is a private system – No anonymous login
    Reply: 220-IPv6 connections are also welcome on this server.
    Reply: 220 You will be disconnected after 15 minutes of inactivity.
    Command: CLNT https://ftptest.net on behalf of 50.**.**.**
    Reply: 530 You aren’t logged in
    Command: AUTH TLS
    Reply: 234 AUTH TLS OK.
    Status: Performing TLS handshake…
    Status: TLS handshake successful, verifying certificate…
    Status: Received 1 certificates from server. *cert info deleted*
    Command: USER mainadminadminAvada
    Reply: 331 User mainadminadminAvada OK. Password required
    Command: PASS ****************
    Error: Connection timed out

    Thanks.
    Peter

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