After a service has no message received for TimeoutSeconds, it may render the connection to this client as disconnected. 0 means no timeout. The client should send at least 2 messages each TimeoutSeconds-period in order to keep the correct connection state on the service. A Service is trying to notify 2 messages each TimeoutSeconds-period in order to check a dual-Http connection.
WcfPartnerMessage Class | SourceForge.AsyncWcfLib Namespace