Duplicate IP Address Triggers Error 442 on Windows Vista
The following error "Reason 442: failed to enable virtual adapter" appears after Vista reports a duplicate IP address detected. Subsequent connections fail with same message, but Vista doesn't report a duplicate IP address detected
To work around error 442, do the following steps:
Step 1 Open "Network and Sharing Center".
Step 2 Select "Manage Network Connections".
Step 3 Enable the Virtual Adapter ("VA"—Cisco VPN Adapter).
Step 4 Right-click on Cisco VPN Adapter and select "Diagnose" from the context menu.
Step 5 Select "Reset the network adapter Local Area Connection X".
If this procedure does not work, run the following command from cmd:
This worked for me, maybe you'll have the same luck.
Used program to first uninstalled the client, in this case i used advanced uninstaller. with the uninstaller cleared all settings out of registry. the go to run prompt run regedit command, and search manually for cisco. find all instances of cisco vpn and delete them. then restart the machine and reinstall the vpn client. warning: be advised that maistakes made in your registry can severely affect your system and render it unstable so be very careful. Also the version of the cisco vpn client that i was working with it is version 5.0.03.0530-k9
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