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-- (deprecated) Microsoft Windows OS (XP/NT/Vista)
---- Vista won't send alternate credentials
bill - 5:10 am on Jun 18, 2008 (gmt 0)Thread source:: http://www.webmasterworld.com/microsoft_windows_os/3676040.htm
What are the permissions on the Vista account? A local machine account may not pass the credentials. Have you tried an Administrator group level account?
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