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Here is a healthy dose of KB articles regarding Windows Vista:
http://support.microsoft.com/?kbid=947229 On a Windows Vista-based computer, Windows Firewall applies local program and port exceptions in the private and public profiles even when the Windows Firewall standard profile settings indicate that these exceptions should not be allowed 2/8/2008 Windows Vista
http://support.microsoft.com/?kbid=947208 Remote access clients that are running Windows Vista cannot access Routing and Remote Access Service servers that use IPv6 2/8/2008 Windows Vista
http://support.microsoft.com/?kbid=947234 Registry entries that are useful in network address translation traversal (NAT-T) security associations in Windows Vista 2/6/2008 Windows Vista
http://support.microsoft.com/?kbid=947209 Error message when you try to establish a dial-up VPN connection that uses EAP-TLS for authentication in Windows Vista: "Error: 0x80420100: There was an unknown error" 2/6/2008 Windows Vista
http://support.microsoft.com/?kbid=947017 Client connections do not authenticate successfully with a Cisco switch when it takes more than five seconds to generate an NAP SoH message on a Windows Vista-based computer or on a Windows XP Service Pack 3-based computer 2/5/2008 Windows Vista
http://support.microsoft.com/?kbid=947239 Description of the Receive Window Auto-Tuning feature for HTTP traffic on Windows Vista-based computers 2/4/2008 Windows Vista