Fiddler: Error 502 Proxy Error

Question

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?

Answer 1

From my case adding this line on OnBeforeRequest function in Fiddler Script fixed it for me,

oSession["x-OverrideSslProtocols"] = " ssl3;tls1.0;tls1.1;tls1.2";