LOOTOTL - Last One Out Turn Off The Lights

Knocknoc keeps a track of the IPs and tries to be kind to users that share IPs. This means that if two users are coming from the same IP, revoking a session for the first user will keep the ACL in place. 

This is the meaning of: Last One Out Turn Off The Lights - if you are last to leave from that IP, only then it is revoked.