Define 502 Server Error
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sections close Computing Ask Jack 502 Bad Gateway error: what to do when you can't get through to a website Viv is
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trying to reach Freecycle but is getting a 502 Bad Gateway error. If you can't get through to a website, here are five things you can try.... This type of error comes from the server, and
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usually has nothing to do with your PC Jack Schofield Thursday 1 August 2013 16.03 BST Last modified on Thursday 1 August 2013 16.39 BST Share on Facebook Share on Twitter Share via Email Share on LinkedIn Share on Google+ Share on WhatsApp Share on Messenger I keep getting an error message, 502 Bad Gateway nginx/0.7.67, when I try to access the Freecycle site. I have rebooted my PC and used 'system restore' several spotnet 502 server error times, but haven't been able to clear it. Do you know how to sort this out? Viv The 'Bad Gateway' error is coming from the server, and usually has nothing to do with your PC. It may just be that the site is overloaded. Often, simply refreshing or reloading the page (Ctrl-F5) will work, but sometimes the problem can persist for days. If so, you could log the time(s) and browser version and submit an error report to the webmaster, because 502 errors can be caused by bugs in the associated PHP programming. In this case, email the admin team at myfreecycleadmin@freecycle.org. If it's an intermittent fault, the simplest option is to wait for 10 minutes and then try again. There are a few things that you can do to try to get through to a site when you get a 502 Bad Gateway error. It's hard to know whether they actually work. It might be that doing them is simply introducing a delay and the site would have worked if you hadn't bothered. Either way, it's useful to have a few things to try when you can't get through to any website. Has it crashed? One of the first things I do when a site isn't responding is to paste its web address
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 triangle 502 server error to the gateway/proxy), but rather that the upstream server and the gateway/proxy do not server error 502 gmail agree on the protocol for exchanging data. Given that Internet protocols are quite clear, it often means that one or both server error 502 web server received an invalid response machines have been incorrectly or incompletely programmed. Fixing 502 errors - general This problem is due to poor IP communication between back-end computers, possibly including the Web server at the site you are trying to https://www.theguardian.com/technology/askjack/2013/aug/01/502-bad-gateway-error visit. Before analysing this problem, you should clear your browser cache completely. If you are surfing the 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 http://www.checkupdown.com/status/E502.html 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 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 ro
a proxy server. The problem is typically caused for one of two reasons: 1 – The Internet Security and Acceleration (ISA) is configured to throw a proxy error to help guard against external or internally-based Internet threats, http://www.tech-faq.com/502-proxy-error.html and 2- The client or server computers are misconfigured or using outdated software. What is a 502 Proxy Error? A 502 proxy error is typically thrown in the HTTP cycle. When the error occurs, a server (does not have to https://www.maxcdn.com/one/tutorial/502-bad-gateway/ be a Web server) is filling a role similar to a proxy or a gateway server. When a client computer sends an HTTP request (typically a web browser, but can be any software application that is capable of making server error an HTTP request), it will pass through the server in order to obtain access to the desired URL. The proxy or gateway subsequently receives a 502 error, or invalid response, from the server located “upstream” in the attempt to fulfill the client request. The majority of the time the error is thrown, the upstream server is functioning appropriately. The proxy or gateway and upstream servers just cannot agree on the appropriate protocol for exchanging the information requested in the original 502 server error client HTTP request. In many of these cases, either the proxy or upstream server are not configured correctly or are running incompatible software. Why Does a 502 Proxy Error Get Thrown? During a typical web browsing session, the following is an example of the classic HTTP cycle when a client computer and web server are communicating: Client Computer: The IP address of the desired website will be obtained from the URL of the site from the DNS server. Client Computer: The computer obtains an IP socket connection to the desired IP address and then sends an HTTP data stream through the IP address. Web Server: HTTP data is sent back to the client computer in response to the original HTTP request. The HTTP response will include status codes and other useful information for the client computer. Client Computer: If there is an error in the client’s request or server’s ability to respond, there will be an HTTP error code of 502 included in the server’s response (502 Proxy Error). How to Fix 502 Proxy Errors (Client Side) One of the most frustrating things for the average computer user is determining where the problem resides when receiving the 502 Proxy Error. Before engaging the webmaster of the site or one’s Internet Service Provider (ISP), it is prudent to troubleshoot the client computer to make sure that it is not the reason that the error is being throw
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If you change hosts, move to a dedicated IP address, start using a Load Balancer, start using CloudFlare, or anything that would cause your origin server's IP address to change, the CDN will stop functioning and you will encounter a 502 Bad Gateway Error. In this case, you need to update the Origin IP in the Pull Zone configuration to match the new IP. Firewall blocking our servers: As a part of a DDoS mitigation process, or as a result of some strict firewall rules, our servers can be blocked from accessing the origin web server. In this case, you just need to whitelist our subnets in your firewall rules. Also, worth mentioning is that some security plugins (for the CMS you use - if you use any)