Http Error 502 Bad Gateway Nginx
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Here are https://www.theguardian.com/technology/askjack/2013/aug/01/502-bad-gateway-error some common ways you might see it.How the 502 Error Appears"502 Bad Gateway""502 Service Temporarily Overloaded""Error 502""Temporary Error (502)" "502 Proxy Error""502 Server Error: The server encountered a temporary error and could not complete your request""HTTP 502""502. That's an error""Bad Gateway: The proxy server received an invalid response from an upstream server""HTTP Error 502 - Bad Gateway"The 502 Bad Gateway error displays inside the Internet browser window, just as web pages do.Twitter's famous "fail whale" error that says Twitter http://pcsupport.about.com/od/findbyerrormessage/a/502error.htm is over capacity is actually a 502 Bad Gateway error (even though a 503 Error would make more sense).A Bad Gateway error received in Windows Update generates a 0x80244021 error code or the message WU_E_PT_HTTP_STATUS_BAD_GATEWAY.When Google services, like Google Search or Gmail, are experiencing a 502 Bad Gateway, they often show Server Error, or sometimes just 502, on the screen.502 Bad Gateway errors are completely independent of your particular setup, meaning that you could see one in any browser, on any operating system, and on any device. Cause of 502 Bad Gateway ErrorsOften, Bad Gateway errors are caused by issues between servers online that you have no control over. However, sometimes there is no real issue but your browser thinks there is one thanks to an issue with your browser, a problem with your home networking equipment, or some other in-your-control reason. Note: Microsoft IIS web servers often give more information about the cause of a particular 502 Bad Gateway error by adding an extra digit after the 502 as in HTTP Error 502.3 - Web server received an invalid response while acting as a gateway or proxy which means Bad Gateway: Forwarder Connection Error (ARR). You can see a complete list here.Tip: An HTTP Error 502.1 - Bad Gateway error refers to a CGI application timeout problem and is better to troubleshoot as a 504 Gateway Timeout issue.How to Fix the 502 B web server you may have already encountered the annoying 502 bad gateway errors. This is pretty common error, are generated most probably by the PHP or FastCGI buffer and timeouts settings. This tutorial shows you how to fix nginx https://asdqwe.net/blog/solutions-502-bad-gateway-error-on-nginx/ 502 bad gateway on the nginx webserver. This post shows how to fix this problem, and the configuration option to prevent it occurring again on reboot. This article assumes you have at least basic knowledge of linux, know https://www.digitalocean.com/community/questions/recurring-502-bad-gateway-nginx-and-504-gateway-time-out-nginx-error how to use the shell, and most importantly, you host your site on your own VPS. The tweak is quite simple. I will show you through the step by step solve 502 bad gateway error on Nginx Method 502 bad 1. Changes in Nginx Config #nano /etc/nginx/nginx.conf http { ... fastcgi_buffers 8 16k; fastcgi_buffer_size 32k; ... } Method 2. change PHP-FPM to listen on a unix socket or TCP socket. #nano /etc/php-fpm.d/www.conf listen = /var/run/php5-fpm.sock To: listen = 127.0.0.1:9000 If you are configuring php-fpm to listen on a Unix socket, you should also check that the socket file has the correct owner and permissions. chmod 0660 /var/run/php5-fpm.sock chown www-data:www-data /var/run/php5-fpm.sock Method 3. Disable APC APC caching can cause 502 bad gateway 502 Bad Gateway issues under particular environments causing segmentation faults. I highly suggest using Memcache(d), but XCache is also a good alternative. Solving "502 Bad Gateway" with nginx & php-fpm After upgrading php-fpm, my PHP-based sites were returning “502 Bad Gateway” errors. This can happen when the php5-fpm package reconfigures itself to listen on a different socket. Here’s how you can solve it. Check to make sure that php-fpm is running with ps aux | grep php - if you can’t see any php-fpm processes in the output, then you may need to re-install php-fpm. If php-fpm is running okay, then skip this first step. sudo apt-get remove php5 php5-cgi php5-fpm sudo apt-get install php5 php5-cgi php5-fpm The thing to notice here is that the order in which you install the packages is important. In the past I have found that installing them in the wrong order causes the packages to be configured incorrectly. Next, get php-fpm to listen on the correct host/port. In/etc/php5/fpm/pool.d/www.conf change the listen value to match the fastcgi_passlocation in your Nginx configuration. For example, I changed mine from: listen = /var/run/php5-fpm.sock To: listen = 127.0.0.1:9000 If you are configuring php-fpm to listen on a Unix socket, you should also check that the socket file has the correct owner and permissions. While I wouldn’t recommend it, you can simply give read-write permissions to all with sudo chmod go+ have one accepted answer. Are you sure you want to replace the current answer with this one? Yes, I'm sure. Changed your mind? You previously marked this answer as accepted. Are you sure you want to unaccept it? Yes, I'm sure. Sign Up Log In submit Tutorials Questions Projects Meetups Main Site logo-horizontal DigitalOcean Community Menu Tutorials Questions Projects Meetups Main Site Sign Up Log In submit View All Results By: giugugl Subscribe Subscribed Share 0 Recurring 502 Bad Gateway (nginx) and 504 Gateway Time-out (nginx) error April 27, 2016 5.4k views LEMP WordPress Hi there Thanks to all community members for the great support provided. I'm dealing with a Vps with Wordpress Installation, Lemp based. Today morning my site was stocked in an 502 Bad Gateway (nginx) so I "service ningx restarted" and "service php5-fpm restarted" but "stop: Unknown instance: php5-fpm start/running, process 1012" So I uncommented the "# reload signal USR2" line within the php5-fpm.conf file But I hadn't any fortune and after 2 hours of missing attempts, I decided to reboot the droplet. So I "sudo shutdown -h now" and then I switched it on by the console on digitalocean.com After that I could restart my php5-fpm and had my website online but the system look unstable and slow. Connecting to the site the server gives me first 502 or 504 error. If I restart php5-fpm and nginx it looks working but if I clic again through the site it gives me again the above errors. Mmmmmmmm..... After checking web server installation, running and syntax configuration file. After checking Port, Dns and permission settings, I went through the log side of the moon. I have to say that I found a lot of stuff but tried to move in a rational way. first I checked the php5-fpm.log.4.gz and it gave me the following lines: [27-Apr-2016 12:25:17] NOTICE: configuration file /etc/php5/fpm/php-fpm.conf test is successful. But I supposed it's been sorted uncommenting the: "# reload signal USR2" Then I move to the nginx dir. and I checked first the: error.log file and I found [notice] 25991#0: using inherited sockets from "9;" and then the site-available.error.log.4 file and I found 2016/04/27 12:13:29 [error] 3085#0: *31943 connect() to unix:/var/run/ajenti-v-php-fcgi-ggtestit-php-fcgi-0.s502 Bad Gateway Meaning