An input/output connection device includes a generating section which generates an inspection packet that has a tag that uniquely identifies the packet, a transmitting section which transmits the inspection packet to the input/output device, a receiving section which receives a packet, a first determining section which determines, on the basis of a tag of the packet received by the receiving section, whether or not the received packet is a packet transmitted in response to the inspection packet transmitted by the transmitting section, and a second determining section which analyzes the received packet and determines whether or not the input/output device is normal when the first determining section determines that the received packet is the packet transmitted in response to the inspection packet.