The present invention is a method and apparatus for capping and grounding an electrical connector to prevent leakage of electromagnetic interference into or out of a chassis for a piece of electronic equipment. In a preferred embodiment of the present invention, a chassis panel has a conductive area that may serve as chassis ground. The electrical connector is secured to the chassis panel, and it is disposed over a penetration in the chassis panel. The electrical connector has a conductive shell that is electrically tied to chassis ground. An EMI plate caps the electrical connector, and it is also electrically tied to chassis ground. The EMI plate permits the transmission of desired signals into and out of the chassis via the electrical connector and associated conductors while substantially preventing leakage of electromagnetic interference through the electrical connector.