A freely rotating connector security shield for use with BNC or other connectors to prevent unauthorized access to the connector. The connectors appropriate for use with the security shield are secured by rotation about the connector axis to mate with the corresponding connector. According to the present invention, such axial connector rotation is prevented by surrounding the connector with a normally freely rotating cylindrical shield. Removal or insertion of the shielded connector from the mating connector requires the use of a corresponding installation tool. The connector is engaged through apertures in the shield which permit radial compressive forces by the installation tool to be applied across the connector. The connector thus held captive can now be connected to and removed from the corresponding mating connector.