Javaws 1.6 w/ proxy and firewall problem

Hi all,
I am trying to start an application on a remote server using javaws. On the remote server, there is a firewall installed which only allows traffic over port 80 and port 1099 to it. Java on my PC is configured to connect via a proxy server on 8088.
When I launch using javaws 1.4 it all works fine. However when I launch using javaws 1.6 I cannot connect to the remote server.
Using a port snooper I noticed the following happening;
1.6
The connection initially opens between my machine and the proxy server on port 8088.
Then another connection opens between my machine and the remote machine on port 56065!
This second connection is refused.
1.4
Only one connection is opened and that is from my machine to the proxy on 8088.
Does anyone know why, on 1.6, javaws opens the second connection, seemingly by-passing the proxy server? Furthermore does anyone know how I might force Javaws to use the proxy server only (or any other solution)?
Regards,
John

tnsping is working correctly. We can ping the host and it is listening on port 1521. Likewise, there are other applications inhouse using this datasource.
Since first posting my question, I have also tried running the test program on WinNT. Same problem arises.
Other suggestions?

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