Core issue
This issue usually occurs if the attributes of the .pcf file for a particular connection is set to read only.
Resolution
Complete these steps in order to resolve this issue:
- Choose Program Files > Cisco Systems > VPN Client > Profiles.
- Choose the connection entry that you wish to delete.
- Right-click on the connection entry and choose Properties.
- If Read Only box is checked, uncheck it.
- Try to delete the connection entry from VPN client. It should now work.
Refer How to install or uninstall a Cisco VPN Client for more information on the installation and uninstallation of the Cisco VPN client.