Isa Server Error Code 502
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The Isa Server Denied The Specified Uniform Resource Locator (url). (12202)
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502 Proxy Error Whenever an ISA or TMG server throws a 502 Proxy Error your way, you know you are probably in for a real hurdle. But with a little familiarity with what a 502 error means, and how it http://www.chicagotech.net/msapps/isa1.htm can be fixed, you will be back in business in little time. First, let’s take a look at the definition of 502 HTTP response code: 502 Bad Gateway The server was acting as a gateway or proxy and received an invalid response from http://stackoverflow.com/questions/8580487/fiddler-error-502-proxy-error the upstream server. Pay close attention to what that is saying. The proxy (meaning your ISA or TMG server) received an invalid response from the upstream server (implying that the internal webserver that you are publishing!). Unfortunately that is not always the case isa server as ISA and TMG can throw that error when they are unhappy about something that a normal browser would readily accept. They can also throw one of several different kinds of 502 depending on the circumstances. Understanding is critical to a quick resolution. Don’t just stop reading at 502, check the rest of the response. Here is how to determine whether the problem is with your ISA/TMG, or on the internal server: 1. Open a browser on the internal network. 2. Access the URL in denied the specified question. 3. If you can view the content successfully, the problem is with your ISA/TMG. If not, the problem is with your webserver. Since this post is about ISA and TMG, let’s assume you are able to view the content internally just fine, so we’ll keep discussing ISA/TMG. 4. Go to your log viewer. In ISA that is Monitoring, or in TMG that is in Logs & Reports. 5. Edit the filter to look at live logs and have the user try again, or filter on the time range to see the error. Add the “Filter by” criteria for HTTP Status Code, and set it equal to 502. 6. Run the query, and examine the results. Some of the frequent causes of ISA/TMG generating 502s are: • A 502 can be thrown by the ISA/TMG when content filtering is enabled and something in the response is being blocked. Disable content filtering and see if you are then able to access the resource. If you are, look at the header in one of the logged errors (in your log, click the more information link on the error) and see what content type is being returned by the published server. Authorize that in your content filter. • If you are using ISA/TMG as a client proxy, and the destination server is running on a non-standard port, you can encounter this error. Create an access rule allowing the non-standard ports. • “502 Proxy Error. No data record is available. (11004)” is generated when the ISA/TMG can
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask 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 Fiddler: Error 502 Proxy Error up vote 1 down vote favorite I am using Fiddler to debug all HTTP request of my ASP.NET application. For a while (about 6 months) I had no problem. All HTTP requests appeared on Fiddler and so on. The last two days Fiddler stoped working :/ Always returns the same error: "The request failed with HTTP status 502: Proxy Error ( The ISA Server denied the specified Uniform Resource Locator (URL). )." The strange thing is that only happens to my application, i. e. all HTTP requests from youtube, email, etc, appear on Fiddler. What is the problem here? asp.net fiddler isaserver share|improve this question edited Dec 20 '11 at 19:21 JayC 5,85921733 asked Dec 20 '11 at 18:55 rpf 1,47162742 Did you install an ISA/ForeFront server in the last two days on your local machine? Any Antivirus/Malware/Firewall software? –Alexander Galkin Dec 20 '11 at 19:00 No, nothing installed. –rpf Dec 20 '11 at 19:02 Microsoft's corporate network hits this; it occurs when the proxy server denies bounce-back to prevent IPSEC circumvention. Without Fiddler running, change IE's proxy settings to "Automatically detect settings" then restart Fiddler. –EricLaw Dec 22 '11 at 13:47 add a comment| 3 Answers 3 active oldest votes up vote 2 down vote I had the same issue with Fiddler - my HTTPS site worked fine in IE, however got 502 error in Chrome. After analyzing the issue, I found that has manual proxy enabled in Fiddler (not recommended): Tools -> Fiddler Options -> Gateaway it was the root cause of this strange behavior. Switching to "System Proxy" made this working for both IE and Chrome. share|improve this answer answered Feb 25 '15 at 8:31 udalmik 4,3031330 add a comment| up vote 1 down vote I had a scenario where production url was https and test was http. When wrongly calling test with h