3.2.6.8 Shut Down
When the protocol is shut down, the client:
MUST stop listening for new messages from the transport. Queued messages MAY be processed.
SHOULD close the network ports as specified in [WS-Discovery] section 2.4.<24>
MUST cancel all active discovery requests, notifying the higher-layer protocol for each one.
SHOULD save all tables in section 3.2.1 for use in the next instantiation.