This issue is dependent on SERVER-9383 being implemented, and is specific to the use case of running multiple mongods on the same server using a common port value but different bind_ip settings.

The unix domain socket name is currently mongodb-#####.sock where ##### is the port number. This file naming convention does not allow more than one mongod on port ##### to have a unix domain socket.

The unix domain socket name should be unique based on the bind_ip and port number.