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Symptom

You visit an intranet website that uses Windows authentication with an IE browser on Windows 7 and expect to be logged in automatically with your current domain credentials. Instead, you are challenged for credentials. Once you enter credentials everything acts normally, but you expect a single sign-in scenario and it doesn't happen. If you visit the same URL with IE on another Windows OS within the domain, single sign-on works as expected.

Cure

A default local security policy in Windows 7 prevents LM and NTLM responses.

  1. Go to Local Security Policy > Security Settings > Local Policies > Security Options
  2. Select Network security: LAN Manager authentication level
  3. Change security setting to Send LM & NTLM responses

win7_secpol

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