TCPS-722 — The proxy has unbound the sockets used for listening for clients
During a proxy termination, the sockets used to listen for clients must be unbound and (in the case of transparent operation) the NAT rules must be deleted. If the proxy is terminating gracefully, it first unbinds the listening sockets, deletes the NAT rules, and logs this message. Than the parent process waits for its children to finish handling of currently connected clients and terminate. If the proxy is terminating immediately, the parent process first kills its children, Then it unbinds sockets, deletes NAT rules, logs this message and terminates. After this message appears, a new proxy may be started listening on sockets previously used by this proxy.