Logging Out

To gracefully log out of a session, a Logout Request message should be sent by the Member. Cboe will finish sending any queued data for that port and will then respond with its own Logout message and close the connection. After receipt of a Logout Request message, Cboe will ignore all other inbound (Member to Cboe) messages except for Client Heartbeat messages.

Cboe Titanium U.S. Options BOE Specification - Logging Out | Cboe