Connector receptacles having protective doors. A protective door may block a card, module, or connector insert from being inserted at an oblique angle to protect contacts in a connector receptacle from damage due to an improper insertion. The protective door may normally be closed in the absence of a card inserted in the connector receptacle. The door may be a front of a cam. A spring or magnet may bias the door in the closed position when no card is inserted. The door may be arranged to stay closed when a card is inserted at an oblique angle. When the card is inserted properly, the cam may rotate about an axis and the door may open allowing the card to access to the contacts of the connector receptacle. A second door in front of the protective door may be included to provide enhanced functionality and to provide a more uniform appearance.