Final answer:
To terminate a VPN session for a user, you need to access the VPN concentrator or firewall that is handling the VPN connections, identify the active session, and terminate it.
Step-by-step explanation:
To terminate a VPN session for a user, you need to access the VPN concentrator or firewall that is handling the VPN connections. This can be done through the administrative interface, which is usually a web-based management console or command line interface. Once you have accessed the appropriate device, you can identify the active VPN sessions and terminate the session associated with the user.
For example, if you are using a Cisco VPN concentrator, you can navigate to the 'Sessions' or 'Monitoring' section of the management console to view the active sessions. From there, you can identify the session associated with the user and terminate it.
Keep in mind that the exact steps may vary depending on the VPN solution you are using. It is always recommended to consult the documentation or seek assistance from your network administrator if you are unsure about the specific process.