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Editorial Team
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Asked: 2026-05-27T18:28:24+00:00

I am using Fiddler to debug all HTTP request of my ASP.NET application. For

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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?

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1 Answer

  1. Editorial Team

    I solved my problem =)

    I seems that something changed at my company network. So I changed the file CustomRules.js from Fiddler and added some lines at OnBeforeRequest.

    Now, everything works just fine

    Best regards.

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