Apache Iis And 502 Proxy Error
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502 Proxy Error Apache Error Reading From Remote Server
Azure Search Schedule Contact me 6 02 2009 Apache, IIS and 502 502 proxy error apache reverse proxy proxy error Gunnar | IIS | 3 Share this postI have some servers in my network. There is one 502 proxy error dns lookup failure public Apache server that proxies requests to these servers. These servers are not directly visible from internet. Some of these servers run IIS and ASP.NET web applications. When accessing these
502 Proxy Error Reason Error Reading From Remote Server
servers through internet then sometimes Apache reports a problem: 502 proxy error. After some digging in internet I found out what’s going on between Apache and IIS. There is very informative bug report in Apache issue tracker - Bug 37770 - proxy: error reading status line from remote server (null). Comment #17 states reason of error as follows: The problem also only
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occurs for us when we use an IIS backend device, with an apache its ok. From a tcpdump the only diff I can see between the two sessions is that the IIS closes the connection when the keep-alive time out is reached with a TCP RST packet, while the apache does a Fin/Ack handshake. When IIS sends this RST packet the next request to the mod_proxy device that’s hits the worker with the RST connection returns the 502 error msg. So, there is some misunderstandings between Apache proxy stuff and IIS. Although some guys suggest to use very long timeouts and hacks to Apache source code there is very simple fix that works very well for me. Make sure you have mod_env enabled and add these lines to Apache configuration file. SetEnv force-proxy-request-1.0 1 SetEnv proxy-nokeepalive 1 After restarting Apache server the communication between Apache and IIS should work fine. After these modifications I have seen no error 502 anymore. Related PostsASP.NET MVC 3: Intranet Application template Deploying ASP.NET MVC 3 web application to server where ASP.NET MVC 3 is not installed Visual Studio
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502 Proxy Error Web Service
developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the 502 proxy error amazon 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 502 Proxy Errors between IIS and http://gunnarpeipman.com/2009/02/apache-iis-and-502-proxy-error/ Apache2 up vote 6 down vote favorite I am currently running apache2 on a SUSE instance @EC2. As part of my site, my data uses mod_proxy to hit a REST server running IIS via Proxy/ReverseProxy. After setting up my vhosts, enabling mod_proxy and establishing my config, I found that I was frequently encountering 502 errors. These errors were of the Proxy Error and Bad Gateway flavour. http://stackoverflow.com/questions/12303087/502-proxy-errors-between-iis-and-apache2 After doing some considerable google, I found that there was a difference in the way IIS and apache terminate their connections which was causing the error. After setting the following environment variables, performance has improved markedly: SetEnv force-proxy-request-1.0 1 SetEnv proxy-nokeepalive 1 SetEnv proxy-initial-not-pooled 1 What I'm wondering is why this works and what an ideal configuration would look like. Is my understanding that, with the Env variables: I am forcing an HTTP 1.0 request (which will standardize the termination expectaions) NOT keeping alive any connections NOT using any pooled connections correct? What if I need to use pooled connections? What if I want to use keep-alives? In short, I'm looking for best practices to replace the toothpick and glue solution I'm currently using apache iis proxy mod-proxy share|improve this question edited Oct 8 '12 at 11:14 gks 2,36131436 asked Sep 6 '12 at 15:08 user1026361 2,18011017 add a comment| 2 Answers 2 active oldest votes up vote 2 down vote I see this question has been around for a while, so I thought I would throw in my 2 cents. More of my experience anyways... As far as I am aware those three env varia
Web Platform Installer Get Help: Ask a Question in our Forums More Help Resources Blogs Forums Home IIS.NET Forums IIS 5 & IIS https://forums.iis.net/t/next/1123546 6 Troubleshooting Intermittent 502 Proxy Error Intermittent 502 Proxy Error RSS 2 replies Last post Jul 23, 2007 06:46 AM by azkotoki ‹ Previous Thread|Next Thread › Print http://www.tech-faq.com/502-proxy-error.html Share Twitter Facebook Email Shortcuts Active Threads Unanswered Threads Unresolved Threads Advanced Search Reply carrics3 1 Post Intermittent 502 Proxy Error May 01, 2007 12:23 PM|carrics3|LINK Hello, We 502 proxy are hosting our application on a local server with IIS6.0here in our college. Periodically, (about 1 in 5 page loads) we get a 502 proxy error. 502 Proxy Error The proxy server received an invalid response from an upstream server. The proxy server could not handle the request GET/Customer/Routes.aspx . Reason: Error reading from remote server 502 proxy error Apache/2.2.3 (Unix) PHP/5.1.4 Server at routefinder.computing.dcu.ie Port 80 Most of the time, refreshing the page brings up the page, only for it to occur a few clicks later. Could anyone point us in the correct direction? We have been onto our proxy admin but they point to server problems on our end as the issue. Any help much appreciated.. Reply tomkmvp 9756 Posts MVPModerator Re: Intermittent 502 Proxy Error May 02, 2007 08:38 AM|tomkmvp|LINK This is going to be hard to figure out and google indicates it's a pretty common problem. Is there anyway you can test your app by bypassing the proxy? Tom Kaminski (former IIS MVP 2002-2010) http://mvp.support.microsoft.com/ Reply azkotoki 1 Post Re: Intermittent 502 Proxy Error Jul 23, 2007 06:46 AM|azkotoki|LINK Hi, If you have control over the apache server config, try adding this line on the virtual host which proxies the requests to the IIS server: ProxyBadHeader Ignore Hope this solves the problem... ‹ Previous Thread|Next Thread
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, 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 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 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 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 c