This object indicates whether this VPDN tunnel has been placed into a 'soft shut' state, which blocks any new user sessions from being added while letting existing sessions continue until they end naturally. Administrators use it to confirm a planned graceful drain of a tunnel is actually in effect before performing maintenance. For example, an operator decommissioning a remote site would soft-shut its tunnel and then watch the tunnel's active-session count drain to zero before finally tearing the tunnel down.