Iis Error Bad Gateway
Contents |
Server Web App Gallery Microsoft Azure Tools Visual Studio Expression Studio Windows Internet Explorer WebMatrix Web Platform Installer Get Help: Ask a Question in our Forums More Help Resources Blogs Forums HomeLearnExtensionsChapter 4. Troubleshooting Application Request RoutingTroubleshooting 502 Errors in ARR 502 bad gateway nginx Troubleshooting 502 Errors in ARR By Richard MarrApril 9, 2012Tools Used in this 502 bad gateway meaning Troubleshooter: IIS Failed Request Tracing Network Monitor Winhttp Tracing This material is provided for informational purposes only. Microsoft makes no warranties, 504 bad gateway express or implied. HTTP 502 - Overview When working with IIS Application Request Routing (ARR) deployments, one of the errors that you may see is "HTTP 502 - Bad Gateway". The 502.3 error means that 502 bad gateway fix - while acting as a proxy - ARR was unable to complete the request to the upstream server and send a response back to the client. This can happen for multiple reasons - for example: failure to connect to the server, no response from the server, or the server took too long to respond (time out). If you are able to reproduce the error by browsing the web farm from
502 Bad Gateway Nginx Means
the controller, and detailed errors are enabled on the server, you may see an error similar to the following: Figure 1 (Click image to expand) The root cause of the error will determine the actions you should take to resolve the issue. 502.3 Timeout Errors The error code in the screenshot above is significant because it contains the return code from WinHTTP, which is what ARR uses to proxy the request and identifies the reason for the failure. You can decode the error code with a tool like err.exe. In this example, the error code maps to ERROR_WINHTTP_TIMEOUT. You can also find this information in the IIS logs for the associated website on the ARR controller. The following is an excerpt from the IIS log entry for the 502.3 error, with most of the fields trimmed for readability: sc-status sc-substatus sc-win32-status time-taken 502 3 12002 29889 The win32 status 12002 maps to the same ERROR_WINHTTP_TIMEOUT error reported in the error page. What exactly timed-out? We investigate this a bit further by enabling Failed Request Tracing on the IIS server. The first thing we can see in the failed request trace log is where the request was sent to in the ARR_SERVER_ROUTED event. The second item I have
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 subsequently send a response back to the client. This can happen for multiple reasons including , failure to
502 Proxy Error Apache
connect to the server , no response from the server, or server took too long to 502 bad gateway linksys 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 502 bad gateway php to help isolate the 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 https://www.iis.net/learn/extensions/troubleshooting-application-request-routing/troubleshooting-502-errors-in-arr 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 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 https://blogs.iis.net/richma/502-3-bad-gateway-the-operation-timed-out-with-iis-application-request-routing-arr 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: Following the example below you can search your log for WinHttpOpenRequest to find your request. The calls to WinHttpSetTimeouts are setting the 4 timeout values based on your ARR time settings found in the Proxy Configuration page of your ARR Server Farm or in the Server Proxy settings. Next we find WinHttpSendRequest then WinHttpReceiveResponse , so we know we are now in the receive stage. Finally we see that the error in is in RecvResponse so we know this is a ReceiveTimeout. For a different failure such as ResolveTimeout we would not see the log make it to WinHttpReceiveResponse and the failure would be logged earlier. 10:23:45.100 :
2, 20123 Share 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 https://blogs.msdn.microsoft.com/benjaminperkins/2012/04/02/application-request-routing-error-502-4-bad-gateway/ 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. https://github.com/aspnet/Hosting/issues/466 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 bad gateway 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 Steven says: January 9, 2014 at 3:08 am Hi, I passed the health test but 502 bad gateway 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 Ober 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 NHibernate .NET Microframework Entity Framework PowerShell HTTP C# Windows 8 WebDAV Web API WinDbg Archives October 2016(3) 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(55) 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
Sign in Pricing Blog Support Search GitHub This repository Watch 118 Star 209 Fork 129 aspnet/Hosting Code Issues 53 Pull requests 0 Projects 0 Pulse Graphs New issue Beta 8 Hosting error: HTTP Error 502.3 - Bad Gateway #466 Closed mdmoura opened this Issue Nov 5, 2015 · 18 comments Projects None yet Labels None yet Milestone No milestone Assignees Tratcher 7 participants mdmoura commented Nov 5, 2015 Hello, I created a new MVC Beta 8 project using simply the default template. When I publish the project and host it on a server using IIS 8.5 I get the error: HTTP Error 502.3 - Bad Gateway There was a connection error while trying to route the request. The CGI application did not return a valid set of HTTP errors. A server acting as a proxy or gateway was unable to process the request due to an error in a parent gateway. I am using Windows Server 2012 R2 with IIS 8.5; I have the application running on a No Managed code application pool I have HttpPlataformHandler 1.2 installed. What might be wrong? Thank You, Miguel Tratcher was assigned by Eilon Nov 5, 2015 aspnet member Eilon commented Nov 5, 2015 @Tratcher can you take a look? aspnet member Tratcher commented Nov 6, 2015 @mdmoura Have you been following #364? aspnet member Tratcher commented Nov 6, 2015 Also https://docs.asp.net/en/latest/publishing/iis.html#common-errors. Most of the bad gateway errors we've seen were the result of installing the incorrect HttpPlatformHandler. GuardRex commented Nov 6, 2015 @mdmoura Explicitly confirm the version at Control Panel > Programs > Programs and Features, where it will say 1.2 in the name if you have the correct version. mdmoura commented Nov 8, 2015 @GuardRex I checked and I have HTTP Plataform Handler 1.2.1959 installed. I followed the information you posted and now I get a very strange behavior: When I click on IIS "Browser website ... " in IIS the browser opens and I see on the browser title "Http Error 502.3 - Bad gateway"