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Cisco Pix 506e firewall blocking Win07 from accessing a specific website?

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The reason DNS suffixs and registration of the network adapter in Windows 7 plays a role in Microsoft's Active Directory domain environment is in Windows 7 network and sharing center. this really is the biggest difference between Windows XP and Window 7. The Network and Sharing Center is a security enhancement that Windows XP doesn't have and can cause problems with Windows 7 finding DNS servers in Active Directory domains with Windows 7. Without going into a log diatribe of why, The Network and Sharing Center handles how Windows 7 works on a TPC/IP network. So to find and join a Windows 7 computer to an Active Directory environment, DNS suffix is almost a requirement to be able to join the Windows 7 comp to a domain as the DNS suffix is used to locate the DNS server that handles the domain being joined to, thus the domain controller to authenticate to for joining the Active Directory domain.