A receptacle connector comprising: an outer housing defining a cavity through the outer housing between a front end and an opposite rear end of the outer housing, the outer housing configured to receive a plug connector into the cavity through a mating opening at the front end; an inner housing disposed within the cavity of the outer housing, the inner housing defining a channel through the inner housing between a mating end and an opposite cable end of the inner housing, the inner housing holding a contact subassembly within the channel, the contact subassembly electrically and mechanically connected to a cable protruding from the cable end of the inner housing, the inner housing including a sleeve extending to the mating end, the sleeve surrounding a mating section of the contact subassembly, the sleeve spaced apart from an interior surface of the outer housing by an annular gap; and an interface seal on an outer surface of the sleeve of the inner housing, the interface seal configured to engage an inner surface of a nose of the plug connector within the annular gap to seal an interface between the sleeve of the inner housing and the nose of the plug connectors, wherein the interface seal extends axially between a front end and a back end, a front segment of the interface seal at the front end engaging the nose of the plug connector, a rear segment of the interface seal at the back end extending across the annular gap and engaging the interior surface of the outer housing to seal an interface between the inner housing and the outer housing, the receptacle connector further comprising a rear housing seal characterized in that the interface seal has a molded body that is formed in-situ on the sleeve, and in that the rear housing seal is bonded to and formed in-situ on the outer surface of the inner housing rearward of the interface seal, the rear housing seal engaging the interior surface of the outer housing at least proximate to the rear end of the outer housing to seal an interface between the inner housing and the outer housing. an outer housing defining a cavity through the outer housing between a front end and an opposite rear end of the outer housing, the outer housing configured to receive a plug connector into the cavity through a mating opening at the front end; an inner housing disposed within the cavity of the outer housing, the inner housing defining a channel through the inner housing between a mating end and an opposite cable end of the inner housing, the inner housing holding a contact subassembly within the channel, the contact subassembly electrically and mechanically connected to a cable protruding from the cable end of the inner housing, the inner housing including a sleeve extending to the mating end, the sleeve surrounding a mating section of the contact subassembly, the sleeve spaced apart from an interior surface of the outer housing by an annular gap; and an interface seal on an outer surface of the sleeve of the inner housing, the interface seal configured to engage an inner surface of a nose of the plug connector within the annular gap to seal an interface between the sleeve of the inner housing and the nose of the plug connectors, wherein the interface seal extends axially between a front end and a back end, a front segment of the interface seal at the front end engaging the nose of the plug connector, a rear segment of the interface seal at the back end extending across the annular gap and engaging the interior surface of the outer housing to seal an interface between the inner housing and the outer housing, the receptacle connector further comprising a rear housing seal characterized in that the interface seal has a molded body that is formed in-situ on the sleeve, and in that the rear housing seal is bonded to and formed in-situ on the outer surface of the inner housing rearward of the interface seal, the rear housing seal engaging the interior surface of the outer housing at least proximate to the rear end of the outer housing to seal an interface between the inner housing and the outer housing.