As of publication, many IPSec VPN Clients have not been updated to support NDIS 6.2. Any network application that performs packet capture, filtering, or injection at the MAC layer (such as VPN clients) will likely have compatibility issues with the mobile broadband stack in Windows 7. The changes were fairly significant and included an update to the Windows NDIS (Network Driver Interface Specification) to version 6.2. Potential Cause: With Windows 7, Microsoft introduced the Mobile Broadband (MB) driver model that more tightly integrates wireless modems and WWAN devices within Windows.
Symptoms: Customer reports that their IPSec Client VPN solution works fine on their Windows XP machines but not their Windows 7 machines.
