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Captive Portal -- DHCP issue

UserMY

Hello,

Setup:
-Sophos XGS2300
-Windows Server running DHCP

We have an issue with client authentication:

The client device receives an IP through our Windows Server (DHCP). The client device then authenticates through the Sophos XG captive portal.
After 24h the DHCP lease time expires and the device might receive a new IP. Now another device might jump onto the previous IP and is now able to use the internet with the previous username as it doesn't prompt for authentication.

Meaning. Peter is now getting logged as Tony because it just stays logged in under the previous username. Obviously any logging and bandwidth allowance is not accurate at this stage.

Any solutions would be appreciated.

Thanks

Mo



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