I found the solution:
How can I make the server use a specific port number or IP address (in case
of multi-homed hosts)?
 JacORB provides two properties that can be set to select a port number and
IP address for servers to listen on.  These properties are OAPort and
OAIAddr. They can be set on the commandline using the -D switch to the Java
interpreter, in the properties file, or in the source code of the server. In
this last case, they are passed as arguments to the ORB.init() call