My guess would be a network problem. Are you sure there's network visibility between the machines and the ports are correct? I'm not seeing anything wrong with the code. We have tests for these scenarios that work fine. You can also try an explicit lookup with an InitialContext() configured to point to the target host to bypass the corbaname:: machinery.
Properties props = new Properties();
String host = ...;
// port defaults to 3700
props.setProperty("org.omg.CORBA.ORBInitialHost",
host);
InitialContext ic = new InitialContext(props);
ic.lookup(...);
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