Problems running applet in web.

Im trying to publish a game made using applet. The server runs normally, and the client shall be accessed by browser. I've already signed the applet, which was being required. Im running the server under linux ( ubuntu ), and the Jar file have read permissions. BUT, trying to run the applet in a machine out of the server, it shows me the error "java.net.ConnectException: Connection refused: connect", when trying to connect to the game, even being the server running and waiting connections. The server runs below a transparent proxy which i dont have permissions to access directly. Running the applet on the AppletViewer in eclipse, the game runs normally with no problems.. Would the problem be about the proxy blocking net connections to the game? It seems to me that its some Java feature, cause the error comes from Java. Could someone help me? Its driving me nuts..
Thanks guys.

From the API:
ConnectException extends SocketException
Signals that an error occurred while attempting to connect a socket to a remote address and port. Typically, the connection was refused remotely (e.g., no process is listening on the remote address/port).

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