In order to avoid an exception during the
orb.resolve_initial_references("NameService")
I launch omniNames (omniORB 3.0.3) as follow :
omniNames -ORBpoa_iiop_name_port 127.0.0.1:2810 2809
And of course my java corba server :
java  -Dorg.omg.CORBA.ORBInitialHost=192.168.4.99 
-Dorg.omg.CORBA.ORBInitialPort=2809 TimeServer
David.