Problem: Website running on local machine with Fiddler Classic running rejects credentials

Updated on Nov 6, 2025

Solution 1:

Configure Fiddler Classic to Authenticate to Server

Solution 2:

Create the Local Security Authority host name that can be referenced in an NTLM authentication request

Solution 3:

Disable the authentication loopback check

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Solution 1:Solution 2:Solution 3:

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