Currently the localhost exception does not apply to the Unix domain socket (tested on OSX) as incoming requests show as AF_LOCAL.
According to man unix 7, AF_LOCAL and AF_UNIX are mutually compatible.
- duplicates
 - 
                    
SERVER-8492 Initial admin user can't be added over a Unix domain socket on OSX
-         
 - Closed
 
 -         
 
- links to