Connect to ServerSocket of codebase host fails thru proxy since 1.6.0_03

Question

hi there,
I have an applet that connects to a server-socket of it's code-base host (i.e. the server it has been loaded from) and loads additional data.
since 1.6.0_03 the connection fails with a SecurityException when there is a proxy server in between the applet machine and the server.
clients with direct connection to the internet work fine.
The server address is read with the following:
serverProtocol = getCodeBase().getProtocol();
serverHost = getCodeBase().getHost();
serverPort = getCodeBase().getPort();
serverPath = getCodeBase().getPath();
the connection to the server socket is then performed with a standard
socket:
try {
socket = new Socket(serverHost , customPort);
} catch (UnknownHostException e) {
System.err.println("ERROR: UnknownHostException: Can't find host: "
+ host + "\n");
return;
} catch (IOException e) {
System.err
.println("ERROR: IOException: Can't open socket on rendezvous port "
+ port + " (on host " + host + ").\n");
return;
The applet is NOT signed but socket connection to its "codebase host" should be allowed! why is the connection not working when there is a proxy server in between? is this a bug in 1.6.0_03 or is something wrong with the applet?
regards,
hans

Answer 1

Hi,
I think I've heard of this problem before, and if memory serves me right it had something to do with the configuration of the IP address of the network interface. It is a Linux box, right?
Anyway, as a workaround you could set -Djava.rmi.server.hostname explicitly to the IP of the interface you're communicating over.
Kind Regards,
Marcus