Http Error 502 Server Hangup
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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 502 error nginx that the upstream server is down (no response to the gateway/proxy), but 502 bad gateway meaning rather that the upstream server and the gateway/proxy do not agree on the protocol for exchanging data. Given that 502 bad gateway fix Internet protocols are quite clear, it often means that one or both machines have been incorrectly or incompletely programmed. Fixing 502 errors - general This problem is due to poor IP please explain this 502 bad gateway error 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 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
502 Police Code
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 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.
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504 Bad Gateway
this site About Us Learn more about Stack Overflow the company Business 502 proxy error Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask http 501 Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up http://www.checkupdown.com/status/E502.html Apache 502 Error - Server Hang up up vote 2 down vote favorite I am using EC2 instance (t2 Medium) with Apache, MySQL and PHP. I am getting on regular basis 502(Server Hangup) error. Trying to find a solution from week but didn't able to resolve it. I am using mpm_prefork with server config.
are problems with the HTTP transactions requested by the browser. These response messages correspond to standard HTTP response codes, but provide more information. A list of the more frequently encountered HTTP response codes is provided in Standard http://www.websense.com/content/support/library/web/v75/wcg_help/HTML.aspx HTTP response messages. You can customize the response messages. The following table lists the https://www.sitepoint.com/community/t/description-server-hangup/1191 Content Gateway hard-coded HTTP messages, their corresponding HTTP response codes, and their corresponding customizable files. Title HTTP Code Description Customizable Filename Access Denied 403 You are not allowed to access the document at location URL. access#denied Bad HTTP request for FTP Object 400 Bad HTTP request for FTP object. ftp#bad_request Cache Read Error 500 bad gateway Error reading from cache. Please retry request. cache#read_error Connection Timed Out 504 Server has not sent any data for too long a time. timeout#inactivity Content Length Required 400 Could not process this request because no Content-Length was specified. request#no_content_length Cycle Detected 400 Your request is prohibited because it would cause an HTTP proxy cycle. request#cycle_detected Forbidden 403 port_number is not an allowed port for SSL connections. (You have made a 502 bad gateway request for a secure SSL connection to a forbidden port number.) access#ssl_forbidden FTP Authentication Required 401 You need to specify a correct user name and password to access the requested FTP document URL. ftp#auth_required FTP Connection Failed 502 Could not connect to the server server_name. connect#failed_connect FTP Error 502 The FTP server server_name returned an error. The request for document URL failed. ftp#error Host Header Required 400 An attempt was made to transparently proxy your request, but this attempt failed because your browser did not send an HTTP Host header. Manually configure your browser to use https:// proxy_name:proxy_port as an HTTP proxy. See your browser's documentation for details. Alternatively, end users can upgrade to a browser that supports the HTTP Host header field. interception#no_host Host Header Required 400 Your browser did not send a Host HTTP header field and therefore the virtual host being requested could not be determined. To access this Web site correctly, you will need to upgrade to a browser that supports the HTTP Host header field. request#no_host HTTP Version Not Supported 505 The origin server server_name is using an unsupported version of the HTTP protocol. response#bad_version Invalid HTTP Request 400 Could not process this client_request HTTP method request for URL. request#syntax_error Inval
2002-07-24 14:11:32 UTC #2 What do you mean by Server Hangup ? I've never herad or anything like this. Did the server crash or what ? system 2002-07-24 14:27:49 UTC #3 Hi sbdi, What do you mean by Server Hangup ? I don't knowm that's why I'm asking Basically, I upload my content onto a server, and it works fine for some period of time. After a while, some images fail to load, and some pages produce an error page (not sure of code, 503...something like that I think) with Server Hangup. Underneath it says, Description: Server Hangup. That is all I can say. Designr 2002-07-24 15:40:40 UTC #4 Maybe you mean "Time Out" error? It could be that your hosts servers are overloaded and that at busy times, your site and contents just cant be found. I was going to mention, be sure to set the correct path to your images (or they will jusy show a box with a red "x" in the corner) but it may not be that if sometimes the images do appear. Decoy.....why dont you post the URL, so we can take a look? Regards system 2002-07-24 23:05:27 UTC #5 I've provided a screenshot of the error page.Below is the code that comes with it.I'm quite certain it's a server hangup as the word's are plastered everywhere.
Server Hangup
Description: Server Hangup
system 2002-07-24 23:33:37 UTC #6 Oh yeah, the URL. If anyone has read any of my earlier posts, then they'll know this web site has had its problems due to matters out of my hands. Being a student, I was given the task of designing a web site for cardiac patients (coronary heart disease). My initial ideas were taken over by a contractor who basically messed it up (please view source code at www.yourheart.org.uk). I was digusted after viewing this, with and tags repeated all over the place along with others. Anyway, after complaining they allowed me to carry on from where I started off before he was brought in. As he designed everything in cold fusion, I decided to go back to basics and hard code it in HTML to be on the safe side. This will allow others after me inexperienced in web design to update it. The URL for the version 2 of the site is at www.yourheart.org.uk/v2/index.html. So far there are approx. 150+ pages, all of which were working perfectly for over a month until last week. If I FTP the page that isn't working, it fixes it for about 5 minutes, and then it goes back to being unavaila