Error 502 Bad Gateway Nginx
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CDN How To's Tutorials Zone Configuration General Settings Push Zone Create a Push Zone Upload Data to a Push Zone Delete a Push Zone Push Zone Settings Push Zone Subusers Pull Zone Create a Pull Zone Delete a Pull Zone Purge CDN Cache Pull Zone Settings CNAMES Create a Zonealias Delete a Zonealias Zone Security How to setup Let's Encrypt TLS How to setup Custom SSL How to order a 502 bad gateway nginx flask SSL certificate Secure Token Create a Zonereferrer (Hotlink Protection) Delete a Zonereferrer Debugging CDN Troubleshooting Guide Technical Questions CDN Error Codes KeyCDN Log Format KeyCDN Log Forwarding Configure your own Syslog Server Knowledge Base Support/Debugging How to solve 502 Bad Gateway Issues? Updated: July 20, 2016 Comments: 1 What does 502 Bad Gateway mean? A 502 Bad Gateway indicates that the edge server (server acting as a proxy) was not able to get a valid or any response from the origin server (also called upstream server). KeyCDN returns a 500 Origin Not Reachable if a 502 Bad Gateway occurred. What does 502 Bad Gateway mean? What are the reasons for 502 Bad Gateway responses? Domain name not resolvable: The domain name is not resolving to the correct IP or it does not resolve to any IP. It is important to note that DNS changes could take same time until they are global fully propagated and active. This is very dependant on the DNS TTL defined per record. Origin server down: The server is not reachable, either because it is down or there is no connectivity to the server given. Firewall blocks request: A firewall blocks the communication between the edge servers and the origin server. This can als
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unaccept it? Yes, I'm sure. Sign Up Log In submit Tutorials Questions Projects Meetups Main Site logo-horizontal DigitalOcean 502 bad gateway nginx rails 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 https://www.keycdn.com/support/502-bad-gateway/ Time-out (nginx) error April 27, 2016 5k 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" https://www.digitalocean.com/community/questions/recurring-502-bad-gateway-nginx-and-504-gateway-time-out-nginx-error 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: "# rel
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. https://asdqwe.net/blog/solutions-502-bad-gateway-error-on-nginx/ This tutorial shows you how to fix nginx 502 bad gateway on the nginx https://wildlyinaccurate.com/solving-502-bad-gateway-with-nginx-php-fpm 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 how to use the shell, and most importantly, you host your site on your own VPS. The tweak is quite simple. I 502 bad will show you through the step by step solve 502 bad gateway error on Nginx Method 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 502 bad gateway 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 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
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_pass location 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+rw /var/run/php5-fpm.sock. Restart php-fpm with sudo service php5-fpm restart and everything should work normally again. This post was written by Joseph Wynn on 22 September, 2012, and last updated on 15 January, 2015. It was posted in [Server Administration] and tagged with [502, bad gateway, nginx, php, php-fpm] wildlyinaccurate Joseph_Wynn A collection of guides & opinions about programming and the state of the web, from a developer at BBC News.