The Logout message initiates or confirms the termination of a FIX session. Disconnecting without exchanging Logout messages should be considered abnormal.

Before actually closing the session, the initiator of the logout should wait for the opposite side to respond with a confirming Logout message. This gives the other application a chance to perform any Gap Fill operations that may be necessary. The session may be terminated if the remote side does not respond in an appropriate timeframe.

After sending the Logout message, the initiator of the logout should not send any messages, unless responding to a Resend Request <35=2>.