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Home/ Questions/Q 9169609
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Editorial Team
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Editorial Team
Asked: June 17, 20262026-06-17T15:54:10+00:00 2026-06-17T15:54:10+00:00

I have fiddler installed and I’m running an MVC3 app through visual studio. Whenever

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I have fiddler installed and I’m running an MVC3 app through visual studio. Whenever I try to hit the MVC page with fiddler (localhost:28267) I get a 401. How can I determine what’s causing this? The page loads fine through IE/VS.

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  1. Editorial Team
    Editorial Team
    2026-06-17T15:54:11+00:00Added an answer on June 17, 2026 at 3:54 pm

    401 means that Fiddler fails to properly negotiate NTLM credentials. Check it with Firebug network console, you’ll probably get the same behavior.

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