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WinINet Support for Negotiate Auth to a Proxy Server in Windows Vista

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By default WinINet supports the following authentication schemes: Negotiate, NTLM, Digest and Basic. However, in previous OS releases WinINet did not support Negotiate authentication to proxys, as it would not respond to a negotiate challenge from a proxy server (See https://support.microsoft.com/?kbid=321728).

We have added support for negotiate authentication to a proxy server in Windows Vista. KB article 321728 is now obsolete and will be updated for the Vista Beta 2 release.

For more information on WinINet authentication, follow the link below: https://msdn.microsoft.com/library/default.asp?url=/library/en-us/wininet/wininet/handling_authentication.asp .

-Jonathan Silvera