Java SE (Java Platform, Standard Edition)

Hi,
I have recently started experimenting with webstart and MS IIS and IE6. I managed to get everything to work on my local machine, but now I want to test it on our server. Our server has windows 2000 and IIS. The server is connected to a router and the router with modem of our internet provider. We can connect to our server using by filling in a password and user name.

What I did is I set up a new website in IIS and placed all the necessary things there for webstart. When someone outside the company is trying to run the application, he gets the webstart screen displaying:
- unable to load resource: http...../myApplication.jnlp;

The detailed exceptions:
JNLPException[category: Download Error : Exception: java.io.IOException : LaunchDesc: null ]
at com.sun.javaws.cache.DownloadProtocol.doDownload(Unknown Source)
at com.sun.javaws.cache.DownloadProtocol.getLaunchFile(Unknown Source)
at com.sun.javaws.LaunchDownload.getUpdatedLaunchDesc(Unknown Source)
at com.sun.javaws.Launcher.downloadResources(Unknown Source)
at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)
at com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)
at com.sun.javaws.Launcher.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

and wrapped:

ava.io.IOException
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at com.sun.javaws.net.BasicNetworkLayer.doRequest(Unknown Source)
at com.sun.javaws.net.BasicNetworkLayer.doGetRequest(Unknown Source)
at com.sun.javaws.cache.DownloadProtocol.doDownload(Unknown Source)
at com.sun.javaws.cache.DownloadProtocol.getLaunchFile(Unknown Source)
at com.sun.javaws.LaunchDownload.getUpdatedLaunchDesc(Unknown Source)
at com.sun.javaws.Launcher.downloadResources(Unknown Source)
at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)
at com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)
at com.sun.javaws.Launcher.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: Server returned HTTP response code: 407

I have looked up the 407 error and this is what it says:
407 Proxy Authentication Required This code is similar to 401 (Unauthorized), but indicates that the client must first authenticate itself with the proxy.

After some futher searching I could not get a clear picture of the solution for this, although it seems a lot of people have a problem with this. Is there anyone who could advise me on this?

kind regards,
Christiaan