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server. That web server requires a challenge-response scheme such as "NTLM" or "Negotiate" for authentication. A pseudo code listing of the script of the sequence follows: Set oXmlHttp = CreateObject("WinHttp.WinHttpRequest.5.1") oXmlHttp.Open "GET", "http://xxxxxxx", XmlHttp_Synchronous oXmlHttp.setRequestHeader "Content-Type", "text/xml; charset=utf-8" oXmlHttp.SetAutoLogonPolicy XmlHttp_AutoLogonPolicy_Always <--enables credentials oXmlHttp.send It does not appear that the SSPI acquired credentials are passed to the launched process in such a way that the WinHTTP interface and related security apparatus can use them. The script communicates properly when I run the script interactively. The script receives a 403/Forbidden within a CVSNT launched process. Any suggestions? Rg, Mike References: 1. Authentication in WinHTTP "http://msdn2.microsoft.com/en-us/library/aa383144.aspx" 2. WinHttpRequestAutoLogonPolicy Enumeration "http://msdn2.microsoft.com/en-us/library/aa384107.aspx" 3. SetAutoLogonPolicy Method of the IWinHttpRequest Interface "http://msdn2.microsoft.com/en-us/library/aa384050.aspx"