Captive Portal -- DHCP issue

Question

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

emmosophos · Answer

Hello there, 
 Thank you for contacting the Sophos Community. 
 If you go to Configure >> Authentication >> Web Authentication >> Captive Portal Behaviour >> Sign Out user (change to "When user is inactive" and fill out the "traffic flow required to consider the user active" ) so the session closes when there&rsquo;s no activity, might help. 
 Regards,

Captive Portal -- DHCP issue

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