Connection Refused -RMI over the internt

Question

Hi All
I have been looking at posts in the forums to solve my problem and now reached a kind of dead end hope someone can help.
I have this RMI application that was desigend to run over a network and it works fine.It was decided that it should be used over the internet. Running as is started the problems ( as expected)
what happened initially was that client would make a connection to the server but would throw an exception when server tried to callback the client.
The forums solution was to have 2 ports opened ( like 1098 and 1099) and connect which I did. This caused a new problem now the client itslef throws a connection exception.
This led me to belive that there would be a networking issue but the netadmin reports that he is seeing traffic reach the server and packets sent back. However I see an exception that is Connection refused to host : <IPADDRESS OF THE SERVER> :connection timed out
Any help would be much appreciated
Thanks

Answer 1

I followed ejp's instructions and everything worked perfectly. Here is a bit more detailed explanation of what I did.
I've been having various problems implementing an RMI Server/Client architecture, with Client Callbacks. My scenario is that both Server and Client are behind Firewall/NAT. In the end I got a fully working implementation. Here are the main things that I did:
Server Side , Local IP: 192.168.1.10. Public (Internet) IP 80.80.80.10
On the Firewall/Router/Local Server PC open port 6620.
On the Router/NAT redirect incoming connections on port 6620 to 192.168.1.10:6620
In the actual program:
System.getProperties().put("java.rmi.server.hostname", IP 80.80.80.10);
UnicastRemoteObject.exportObject(this, 6620);
Client Side, Local IP: 10.0.1.123 Public (Internet) IP 70.70.70.20
On the Firewall/Router/Local Server PC open port 1999.
On the Router/NAT redirect incoming connections on port 1999 to 10.0.1.123:1999
In the actual program:
System.getProperties().put("java.rmi.server.hostname", 70.70.70.20);
UnicastRemoteObject.exportObject(this, 1999);
Hope this helps.
Iraklis