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Error: "Reason 442: Failed to Enable Virtual Adapter" with Cisco VPN client in Windows Vista

To resolve this problem, set cvpnd.exe and vpngui.exe to "Windows XP Service Pack 2" compatibility mode.

Problem

When you try to connect with the Cisco VPN client in Windows Vista, you receive the following error:

Reason 442: Failed to Enable Virtual Adapter

This error prevents you from connecting with Cisco VPN client.

Solution

To resolve this problem in Windows Vista, do the following:

  1. Click Start > Computer.
  2. Double-click your C: drive.
  3. Double-click Program Files > Cisco Systems > VPN Client.
  4. Right-click on cvpnd.exe and select Properties.
  5. Click the Compatibility tab.
  6. Put a check mark next to the option, Run this program in compatibility mode for:.
  7. Make sure Windows XP Service Pack 2 is selected.
  8. Click Apply and then click OK.
  9. Right-click vpngui.exe and select Properties.
  10. Put a check mark next to the option, Run this program in compatibility mode for:.
  11. Make sure Windows XP Service Pack 2 is selected.
  12. Click Apply and then click OK.
  13. Restart your computer.

After your computer restarts, you may connect with Cisco VPN client.