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Asked: 2026-05-13T06:27:50+00:00

I am attempting to debug a (RESTful) WCF app using Fiddler. I run my

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I am attempting to debug a (RESTful) WCF app using Fiddler. I run my project via VS IDE – which launches my app in the ASP.NET Development Server aka Cassini. I then launch Fiddler and in the Request Builder tab enter the following: “http://localhost:1066/GeneralService/sections/summary” with GET as the http method.

Fiddler responds with “[Fiddler] Connection to localhost failed.
Exception Text: No connection could be made because the target machine actively refused it ::1:1066 “

Is there some way for me to debug an app running on Cassini?

Thanks,
Steve

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1 Answer

  1. Editorial Team

    Change the url to http://ipv4.fiddler:1066/GeneralService/sections/summary to enable fiddler to listen on localhost

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