502 Bad Gateway Iis Error
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of the errors you might see is 502.3 Bad Gateway. The 502.3 means while acting as a proxy ARR was unable to complete the request to the upstream server and error 502 bad gateway nginx subsequently send a response back to the client. This can happen for error 502 bad gateway hostgator multiple reasons including , failure to connect to the server , no response from the server, or server took too
Error 502 Bad Gateway Cloudflare
long to respond (time out). For the purposes of this post we are going to look at a timeout error and the data that can be gathered to help isolate the
Please Explain This 502 Bad Gateway Error
cause. If you are looking at this post then you probably have already seen this error or something similar. This is shown in the browser when detailed errors are enabled in IIS. Another way to identify the source of the 502.3 is with Failed Request Tracing logs in IIS configured to capture Status code 502. From the message the key details are the ErrorCode proxy 502 error which you can use to map to to the Winhttp error message, which in this case is ERROR_WINHTTP_TIMEOUT ( Reference WinHttp Error Codes). You will also see in the next line that this is translated to “The operation timed out”. Note that both the 0x80072ee2 and 2147954402 map to the same error ERROR_WINHTTP_TIMEOUT. Now that we know its a timeout we need to determine what type of timeout occurred. Here is a list of the timeouts that can occur in Winhttp ( which if you haven't guessed already is what ARR uses to proxy requests) ResolveTimeout : This occurs if name resolution takes longer than the specified timeout period. ConnectTimeout : This occurs if it takes longer than the specified timeout period to connect to the server after the name resolved. SendTimeout : If sending a request takes longer than this time-out value, the send is canceled. ReceiveTimeout : If a response takes longer than this time-out value, the request is canceled. To identify what type of timeout we can use Winhttp’s built in logging,These can be enabled from the command line on the ARR server using NETSH. Winhttp Traces
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Http Error 502.3 - Bad Gateway The Operation Timed Out
1 reply Last post Sep 10, 2013 02:55 AM by Angie xu - http error 502.3 - bad gateway a connection with the server could not be established MSFT ‹ Previous Thread|Next Thread › Print Share Twitter Facebook Email Shortcuts Active Threads Unanswered Threads Unresolved Threads Advanced http error 502.3 - bad gateway a security error occurred Search Reply ahmedilyas 43 Posts 502 error Sep 09, 2013 06:48 AM|ahmedilyas|LINK Hi. I am not sure if this is the right place to post this. I created a web farm for http://blogs.iis.net/richma/502-3-bad-gateway-the-operation-timed-out-with-iis-application-request-routing-arr a test environment with 2 secondary servers and 1 primary. All works fine. using WS2008R2 + SP1 and IIS 7.5 The web farm works great but then I get this error sometimes and thereafter fails to work: 502 - Web server received an invalid response while acting as a gateway or proxy server. There is a problem with the page you are looking for, http://forums.iis.net/t/1201412.aspx?502+error and it cannot be displayed. When the Web server (while acting as a gateway or proxy) contacted the upstream content server, it received an invalid response from the content server. I am using the ARR module in IIS and set to round robin to illustrate that the website hits different servers. what am I missing? C# MVP Reply Angie xu - M... 670 Posts Microsoft Re: 502 error Sep 10, 2013 02:55 AM|Angie xu - MSFT|LINK Hi ahmedilyas 502 - Web server received an invalid response while acting as a gateway or proxy. IIS 7.0, IIS 7.5, and IIS 8.0 define the following HTTP status codes that indicate a more specific cause of a 502 error: ◦502.1 - CGI application timeout. Solution: http://support.microsoft.com/kb/942059/en-us ◦502.2 - Bad gateway: Premature Exit. Solution: http://support.microsoft.com/kb/942057 ◦502.3 - Bad Gateway: Forwarder Connection Error (ARR). ◦502.4 - Bad Gateway: No Server (ARR). Regards Angie xu MSDN Community Support Please remember to "Mark as Answer" the responses that resolved your issue. ‹ Previous Thread|Next Thread › This site is managed for Microsoft by Neudesic, LLC. | © 2016 Microsoft. All rights reserved. Privacy Statement Terms
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 http://www.checkupdown.com/status/E502.html upstream server and the gateway/proxy do not agree on the protocol for exchanging data. Given that https://blogs.msdn.microsoft.com/benjaminperkins/2012/04/02/application-request-routing-error-502-4-bad-gateway/ 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 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 bad gateway 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 case, you need to fix whatever it is that is preventing you reaching the Internet. If you get this problem for only 502 bad gateway 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 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 nam
2, 20123 0 0 0 I was setting up an Application Request Routing server and received the error shown in Figure 1 when I attempted to access the ARR URL. Figure 1, HTTP Error 502.4 – Bad Gateway The cause wasdue tothe Health Status of the servers being set to “Unhealthy” as shown in Figure 2. They were set to "Unhealthy"becausethe Health Tests which I previously configured failed. Figure 2, Monitoring and Management, Health status set to Unhealthy To correct this, I first resolved the issues with my Health Tests. I thenselected one of the app* servers andin the Action pain selected “Set Server as Healthy” as shown in Figure 3. Figure 3, Monitoring and Management, Set Server as Healthy You should be aware that if the Health Test you configure fails, the server will be set to Unhealthy. Tags Application Request Routing Comments (3) Cancel reply Name * Email * Website Anonymous says: January 9, 2014 at 3:08 am Hi, I passed the health test but it told me that my server is unhealthy. And the imcoming request gave me a 404 error. Would you mind giving me any suggestions on that? Reply Anonymous says: August 1, 2014 at 12:30 am I've got similar situation :/ sometimes, after IIS restart, my sites works, but only for a while, after few refreshes i get 502.4 error 🙁 I think it could be connected with proxy settings. Reply benjaminperkins says: July 30, 2015 at 2:53 am Hi, you might get some good response if you ask the same question on the IIS forums here: http://forums.iis.net/ Reply Subscribe Blog via Email Subscribe to this blog and receive notifications of new posts by email. Subscribe! Unsubscribe Publications Translate this pageSocial MediaPopular TagsIIS Azure Web Apps Azure Debugging IIS Labs (CSharpGuitarBugs) Application Request Routing IoT ASP.NET Security Gadgeteer .NET Microframework Entity Framework NHibernate HTTP C# Windows 8 PowerShell WebDAV Web API WinDbg Archives September 2016(4) August 2016(3) July 2016(11) June 2016(17) May 2016(3) April 2016(5) March 2016(3) February 2016(2) January 2016(4) All of 2016(52) All of 2015(24) All of 2014(29) All of 2013(27) All of 2012(28) All of 2011(12) Privacy & Cookies Terms of Use Trademarks © 2016 Microsoft