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Fiddler replaying requests to the ASP.NET Development Server: XP works but Vista not, or “when localhost is not 127.0.0.1 in Fiddler 2″

The Wiert Corner – Today, I bumped into something utterly strange: requests replayed through Fiddler 2 to a locally running ASP.NET Development Server on Vista using localhost URLs did not give a connection. I use ASP.NET from both C# and Delphi Prism. Most of my development work is on Windows XP (see notes below) but I test on many platforms. Moving one of the projects from XP to Vista, and testing with Fiddler, I found that when using Fiddler 2: This form of URL fails on Vista, but works on XP: http://localhost:49703 This form of URL works both on Vista, and XP: http://127.0.0.1:49703 So on Vista – ...

Favorite? Off-Topic? jpluimers @ 2009-12-09 04:00