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Sophos XG firewall: SSL VPN disconnecting after 8 hours

Issue:

SSL VPN connecting is disconnecting after 8 hours if user is using OTP authentication. If the user did not use OTP, then SSL VPN is not disconnecting.

Resolution:

Key life time in SSL VPN indicates that after every 8 hours, key renegotiation will happen.

Please look into the below screenshot of VPN settings

VPN settings
VPN settings

OTP will not be vaild for 8 hours, so SSL VPN negotiation fails. You can increase the key life to 10 hours or 12 hours, but it will compromise your network security.