3.1.5.4 Receiving a ConnectionParameters Packet

If SessionState is not set to WAITING_CP_MSG or WAITING_CPR_MSG, the protocol MUST close the session as specified in Closing a Session (section 3.1.5.9).

A ConnectionParameters Packet (section 2.2.2) is either a request from an initiator to an acceptor or a response from an acceptor to an initiator for a ConnectionParameters Packet received during protocol session initialization.