A connector securing device (10) includes a top wall (12), a bottom wall (14), a pair of side walls (16, 26), and an end wall (18) cooperatively defining a cavity (20) therebetween for receiving a connector (50) therein. A pair of resilient tabs (30) is formed in front portions of the top and bottom walls respectively, and each resilient tab forms an outer latching portion (34) at a free end thereof. The end wall defines a through hole (40) for extension of a cable (52) of the connector therethrough. After the connector is received in the connector securing device, the combined connector and connector securing device is plugged into aligned openings (64, 68) defined in an I/O interface (60). The latching portions engage in one of the openings of the I/O interface, thereby protecting the connector from accidental detachment from a complementary mating connector at the I/O interface.