Problem connecting 2 machines

Question

My application runs ok when i do it localy but when i run server in a different machine i get the follwing error. This happen after i connect to the server :
Exception in thread "main" java.rmi.RemoteException: connection failed to host: 127.0.0.1; nested exception is:
java.net.ConnectException: Connection refused
at gnu.java.rmi.server.UnicastRef.invokeCommon(libgcj.so.7)
at gnu.java.rmi.server.UnicastRef.invoke(libgcj.so.7)
at PowerServiceServer_Stub.power(Unknown Source)
at PowerServiceClient.main(PowerServiceClient.java:76)
Caused by: java.net.ConnectException: Connection refused
at gnu.java.net.PlainSocketImpl.connect(libgcj.so.7)
at java.net.Socket.connect(libgcj.so.7)
at java.net.Socket.connect(libgcj.so.7)
at java.net.Socket.<init>(libgcj.so.7)
at java.net.Socket.<init>(libgcj.so.7)
at gnu.java.rmi.server.RMIDefaultSocketFactory.createSocket(libgcj.so.7)
at gnu.java.rmi.server.UnicastConnectionManager.getClientConnection(libgcj.so.7)
at gnu.java.rmi.server.UnicastConnectionManager.getConnection(libgcj.so.7)
at gnu.java.rmi.server.UnicastRef.invokeCommon(libgcj.so.7)
...3 more
This is how i call registry in the client code, where args[0] i give as an input before the program runs (for example cs4489.in.cs.xxx.xx)
PowerService service = (PowerService) Naming.lookup
("rmi://" + args[0] + "/PowerService");
And this is the code in the server code in machine 2
PowerServiceServer svr = new PowerServiceServer();
Naming.bind ("PowerService", svr);
PowerServise is interface class

Answer 1

I really dont understand java -Djava.rmi.server.hostname=<IP address of server> -Djava.security.policy=<URL of policy file>
Also why are you trying to setjava.security.policy
on the command line and in the code?I dont know i read it from another forum. I don't think so. If you did it was rubbish. You either set a property with -D on the command line or in the code. If you set it on both, the setting in the code overrides the setting on the command line.
What i should doSet java.rmi.server.hostname at the server JVM to the correct public IP address of the server, as shown above.