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 1Open "Network and Sharing Center".
Step 2Select "Manage Network Connections".
Step 3Enable the Virtual Adapter ("VA"—Cisco VPN? Adapter).
Step 4Right-click on Cisco VPN Adapter and select "Diagnose" from the context menu.
Step 5Select "Reset the network adapter Local Area Connection X".
If this procedure does not work, run the following command from cmd:
This resolves the issue until Vista reports a duplicate IP address again. Follow the preceding steps to resolve it again.
If that doesn't work, you might have UAC enabled. If so, you must run cmd as administrator and repeat the previous registry workaround. To run as an administrator, right click on cmd and select "Run as Administrator".
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