Bad Gateway Apache Error
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502 Bad Gateway Nginx Apache
The proxy server received an invalid response from an upstream server. The proxy server could not handle the request GET /the/page.do. Reason: Error reading from remote server If you think this is a server error, please contact the webmaster. Error 502 Tomcat has plenty of threads, so it's not thread-constrained. We're pushing 2400 users via JMeter against the app. All the boxes are sitting inside our firewall on a fast unloaded network, so there shouldn't be any network problems. Anyone have any cydia bad gateway error suggestions for things to look at or try? We're heading to tcpdump next. UPDATE 10/21/08: Still haven't figured this out. Seeing only a very small number of these under load. The answers below haven't provided any magical answers...yet. :) java apache tomcat mod-proxy share|improve this question edited Oct 21 '08 at 19:45 community wiki 2 revsAlex Miller I am facing this problem for some time during my running application –Uday A. Navapara Mar 12 '15 at 5:27 add a comment| 7 Answers 7 active oldest votes up vote 32 down vote Just to add some specific settings, I had a similar setup (with Apache 2.0.63 reverse proxying onto Tomcat 5.0.27). For certain URLs the Tomcat server could take perhaps 20 minutes to return a page. I ended up modifying the following settings in the Apache configuration file to prevent it from timing out with its proxy operation (with a large over-spill factor in case Tomcat took longer to return a page): Timeout 5400 ProxyTimeout 5400 Some backgound ProxyTimeout alone wasn't enough. Looking at the documentation for Timeout I'm guessing (I'm not sure) that this is because while Apache is waiting for a response from Tomcat, there is no traffic flowing between Apache and the Browser (or whatever http client) - and so Apache closes down the connection to the browser. I found that if I left the Timeout setting at its default (300 seconds), then if the proxied request to Tomcat took
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502 Bad Gateway Apache Proxy
Fisher PC Support Expert Share Pin Tweet Submit Stumble Post Share By Tim Fisher Updated August 31, 2016. The 502 Bad Gateway error is an HTTP status code that means that one server received http://stackoverflow.com/questions/169453/bad-gateway-502-error-with-apache-mod-proxy-and-tomcat an invalid response from another server.The Bad Gateway error can be customized by each website. While fairly uncommon, different web servers do describe this error differently. Here are some common ways you might see it.How You Might See the 502 Error"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 http://pcsupport.about.com/od/findbyerrormessage/a/502error.htm 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 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. continue reading below our video How to Fix Browser Error Codes 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 o
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 https://www.keycdn.com/support/502-bad-gateway/ Settings CNAMES Create a Zonealias Delete a Zonealias Zone Security How to setup Let's http://www.gossamer-threads.com/lists/apache/users/377583 Encrypt TLS How to setup 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 Getting Started General Account Management Integration Guides CMS Integration Guides bad gateway Framework Integration 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 502 bad gateway TLS How to setup 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 give
Post #1 of 6 (7213 views) Permalink mod_proxy issue - intermittent 502 response Hi, I'm running Apache/2.0.52 as a reverse proxy on a RHE4 box, the backend app server is on a separate machine again RHE4, running Apache/2.0.52 and mod_perl 1.99_16. There are intermittent 502 responses being generated by the proxy although a page refresh generally resolves the issue, we are trying to get a configuration of 2 RP boxes in front of 3 mod_perl app servers into production but will need to understand / resolve the issue of these intermittent 502 responses first. [Thu Nov 26 15:35:09 2009] [error] [client 88.96.233.45] proxy: error reading status line from remote server xxx.xxxxxx.co.uk, referer: http://xxx.xxxx.co.uk/mens/casual/casual/71/brand-/all-/start- [Thu Nov 26 15:35:09 2009] [error] [client 88.96.233.45] proxy: Error reading from remote server returned by /mens/smart/smart/70/brand-/all-/start-, referer: http://xxxx.xxxxxxx.co.uk/mens/casual/casual/71/brand-/all-/start- Can someone shed further light on what the problem is and how to resolve it pls, I'm happy to send virtual host confs if someone wishes to dig little deeper. Note at this point I'm using mod_rewrite [P] to proxy the requests to the app server rather than using ProxyPass as we have many rewrites in the conf. I've googled around and have seen that others have observed similar scenarios when using this setup in Apache 2.0 but have not seen anything specific about a resolution or path to resolution. Your help gratefully appreciated. Kind regards, Cris Cristian Pini Foresite Business Solutions Ltd Tel: 020 8540 0040 Direct: 020 8545 6813 http://www.fsite.com Owen.Boyle at six-group Nov27,2009,1:16AM Post #2 of 6 (7087 views) Permalink RE: mod_proxy issue - intermittent 502 response [In reply to] 502 is bad gateway, which means that apache and the back-end server have got into a protocol argument. Usually this is due to a bad response from the back-end (as your log entries indicate). Why do you think apache is the problem? Rgds, Owen Boyle Disclaimer: Any disclaimer attached to this message may be ignored. ______________________________