Customer Service Center

Environment/Versions Spirent TestCenter. TCP - ACK/RST Answer If a TCP SYN packet is sent when a client wants to connect on a particular port, but if the destination/server, for some reason, does not want to accept the packet, it would send an ACK+RST packet. RST/ACK is used to end a TCP session. The packet is ACKnowledging receipt of the previous packet in the stream, and then closing that same session with a RST (Reset) packet being sent to the far end to let it know the connection is being closed. Since this is the normal way TCP operates, there's no way to disable it on the Spirent TestCenter Application.