When a subagent is finished and wants to end processing, it should first UNREGISTER its subtrees and then close the connection with the agent. To do so, the subagent must send a DPI CLOSE packet, which specifies a reason for the closing. See DPI CLOSE reason codes for a list of valid codes. You should not expect a response to the CLOSE request.

A subagent should also be prepared to handle an incoming DPI CLOSE packet from the agent. In this case, the packet contains a reason code for the CLOSE request. A subagent does not have to send a response to a CLOSE request. The agent assumes that the subagent will handle it appropriately. The close takes place regardless of what the subagent does with it.