502 Error Server
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This server received an invalid response from an upstream server it accessed to fulfil the request. This usually does not mean that the upstream server is down (no response to the gateway/proxy), but rather that the upstream 502 server error gmail server and the gateway/proxy do not agree on the protocol for exchanging data. Given that Internet
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protocols are quite clear, it often means that one or both machines have been incorrectly or incompletely programmed. Fixing 502 errors - general This 502 server error google problem is due to poor IP communication between back-end computers, possibly including the Web server at the site you are trying to visit. Before analysing this problem, you should clear your browser cache completely. If you are surfing the
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Web and see this problem for all Web sites you try to visit, then either 1) your ISP has a major equipment failure/overload or 2) there is something wrong with your internal Internet connection e.g. your firewall is not functioning correctly. In the first case, only your ISP can help you. In the second case, you need to fix whatever it is that is preventing you reaching the Internet. If you get this problem for only some of the Web 502 proxy server error sites you try to visit then it is likely to be a problem at those sites i.e. one of their pieces of equipment is failing/overloaded. Contact the people at those sites. Fixing 502 errors - CheckUpDown Our service monitors your site for HTTP errors like 502. Use of proxies and caching is increasing on the Web. Our CheckUpDown robot will always try to "drill through" to the real computer that actually hosts the Web site, but we do not have complete control over where our HTTP request actually ends up. If only one link in the chain of computers dealing with our HTTP request is broken, then an error such as 502 can easily occur. Please contact us (email preferred) whenever you encounter 502 errors - there is nothing you can do to sort them out. We then have to liaise with your ISP and the vendor of the Web server software so that they can review the flow of IP data traffic between various computers under their control. 502 errors in the HTTP cycle Any client (e.g. your Web browser or our CheckUpDown robot) goes through the following cycle when it communicates with the Web server: Obtain an IP address from the IP name of the site (the site URL without the leading 'http://'). This lookup (conversion of IP name to IP address) is provided by domain name servers (DNSs). Open an IP socket conne
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TLS How to setup Custom SSL How to order a SSL certificate Secure Token Create a Zonereferrer (Hotlink Protection) Delete error 502 server error 1 a Zonereferrer Debugging CDN Troubleshooting Guide Technical Questions CDN Error Codes KeyCDN Log Format KeyCDN Log Forwarding Configure your own Syslog Server Getting Started General Account Management Integration Guides CMS Integration Guides Framework Integration http://www.checkupdown.com/status/E502.html Guides Custom CDN Integration 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 https://www.keycdn.com/support/502-bad-gateway/ Custom SSL How to order a 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 th
Support/Billing Login Plans Enterprise Our Difference Support Blog Contact Search Login Learn About Our Platform Set Up My Site Make My Site Faster Troubleshoot Enhance My Site Manage My Account Browse https://wpengine.com/support/troubleshooting-502-error/ All You are here: / Support Posts / Troubleshooting a 502 Error Troubleshooting https://technet.microsoft.com/en-us/library/bb794799.aspx a 502 Error On this page: We break down just what a 502 error is and what you can do to help reduce them. Tags: Error, Support Updated: August 1st, 2016 What exactly is a 502 Error and what can I do to get rid of it? The 502 error is produced by server error WP Engine that signals a request for either a page, script, process, or query has taken too long to complete and has been cancelled (killed). The digits, 5xx and 02, are HTTP Status Codes which correspond to 5xx meaning Server Error while 02 refers to Bad Gateway. Combating 502 errors can be an art in itself since the causes of these can be deep in the code 502 server error of a site and not easily identifiable. Because of this, we highly recommend 502 errors and the code itself be consulted with a developer - we have a recommendation list here It is important to note that the 502 error is produced from our servers killing the request based on the factor of time. Troubleshooting WordPress with the WP Engine Error Log is a great companion article for yourself and your developer in diagnosing 502 errors, specifically Long and Killed Query logs. The following is a brief list that should help in reducing 502 errors for your site: Your Plugins, Themes, and WordPress Core files are up to date. Only site functionality dependent plugins are enabled. Your MySQL queries are efficient and optimized - only search for what you need. If none of these seem to apply, then please contact WP Engine Support through your User Portal. Can you just turn the "kill script" off on my install or server? The error, or kill script, is done to ensure our servers are able to serve the maximum amount of requests without waiting for other requests to finish, which we've seen take minutes to even hours to complete. The
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