Cisco VPN client fails on Windows 7 with the following error:
Secure VPN Connection terminated locally by the client Reason 442: Failed to enable virtual adapter
This is usually because Windows 7 and Vista reports a duplicate IP address detected.
Subsequent connections fail with the same message, but the OS does not report the duplicate IP.
To resolve the problem carry out the following:
Run CMD as an administrator (right-click and “run as admin”)
reg add HKLMSystemCurrentControlSetServicesTcpipParameters /v ArpRetryCount /t REG_DWORD /d 0 /f
Reboot the PC.
Next open > Network and Sharing Center
Click > Change adapter settings
Right-click on the wireless adapter settings find the share tab and unshare the connection.
The VPN should now work.