When you are on a Windows domain, with ISA 2004 or ISA 2006 policing the internet access, there are high chances that you get a silly windows network error message stating “No internet access” or “Additional logon information may be required” (paraody! You have internet access, only Windows 7 connection manager assumes you don’t!!!).
After trying numerous methods, the latest working solution (confirmed) for us is using the ISA 2004/ISA 2006 internal IP address as the default gateway for Windows 7 clients!
Though we don’t have any technical explanations to provide, we believe by diverting the traffic towards ISA somehow deals the NTLM authentication properly and the dreaded error messages being dealt in proper manner.
Windows7bugs team, Kuwait