Cisco AnyConnect fails after initiating connection

The solution for me was to disable Internet Connection Sharing (ICS).

To resolve this issue:

  1. Click the Windows Start button.
  2. Click on Control Panel.
  3. Set View by: to Category.
  4. Click on View network status and tasks under Network and Internet.
  5. Click on Change adapter settings.
  6. Look for Shared in the Status column and right-click that connection and click Properties.
  7. Click the Sharing tab.
  8. Clear the Allow other network users to connect through this computer’s Internet connection check box.
  9. Click OK.
  10. Reinstall Cisco AnyConnect.