An indication of whether or not the SSL close protocol
is enforced.
If 'true', the close protocol is enforced. A
close-notify alert message is sent to the peer, and a
close-notify alert message is expected from the peer.
If 'false', the close protocol is not enforced. The
proxy service sends a close-notify alert message to
the peer; however, the proxy service does not expect
a close-notify alert from the peer before tearing down
the session.