You can close a message sequence if you do not want a reliable messaging client to send any new messages using the specified sequence, other than those already accepted and being processed by the reliable messaging server.

When a reliable messaging sequence is closed, the reliable messaging server will not accept any new messages of the same sequence. However, the reliable messaging server will continue to track the closed sequence and respond to acknowledgment requests for messages in the closed sequence.

Only a reliable messaging client can close a message sequence. After a reliable messaging sequence is closed, only a client can terminate the sequence. If there is no activity related to the closed sequence over the specified inactivity timeout interval, the reliable messaging client marks the sequence as timed out.