Core issue
This issue is caused by a corrupted VPN client installation or a clash with the operating system.
Resolution
To resolve this problem, perform these steps:
- Manually uninstall the Cisco VPN client. Refer to How to Manually Uninstall the Cisco VPN Client 3.5 and Later for Windows 2000.
Note: Remove the setup.exe file from the temp files directory, since it may trigger setup to run again.
- Uninstall Deterministic Network Enhancer (DNE). Perform these steps.
- Select My Network Places > LAN settings > Properties > Deterministic Network Enhancer, and remove the check mark next to it. Highlight it and click uninstall.
- Search files with the name DNE and delete all files and entries.
- Uninstall network adapters from the machine.
- Restart the computer, and cancel the automatic installation of network adapters.
- Make sure there is no antivirus and firewall enabled before installing the VPN Client.
- Install the VPN client. Refer to Installing the VPN Client.
- Reinstall the network adapters.
- Check the VPN connectivity with VPN server. If it succeeds, enable the antivirus and personal firewall in the machine.
