Applet don't load, can't find the class, but is on the archve list. Tomcat5

Question

Hi I've an applet in a JSP that runs on a Tomcat 5.5 under Windows Vista. My problem is that my page can't load the applet because a connection refused exception.
network: No se ha encontrado entrada de cach� [URL: http://localhost:2000/globalcard/jars/com/syc/client/ScanApplet.class, versi�n: null]
network: Conectando http://localhost:2000/globalcard/jars/com/syc/client/ScanApplet.class con proxy=DIRECT
network: No se ha encontrado entrada de cach� [URL: http://localhost:2000/globalcard/jars/com/syc/client/ScanApplet.class, versi�n: null]
network: Conectando http://localhost:2000/globalcard/jars/com/syc/client/ScanApplet.class con proxy=DIRECT
cargar: clase com.syc.client.ScanApplet no encontrada.
java.lang.ClassNotFoundException: com.syc.client.ScanApplet
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadCode(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
basic: Excepci�n: java.lang.ClassNotFoundException: com.syc.client.ScanAppletmore....The strange thing is that if I copy &paste the url in a browser window, it finds the jar and ask to open or save. So I suppouse is something on the sandbox of the applet or something like that. Why I can find the jar using the URL, but why the applet can't? Other thing that I don't know if is important for this is that I can't find the page using my IP or 127.0.0.1, it only works using localhost.
And yes, my jar is signed. In fact it works perfect on a non Windows-Vista machine, so I suppouse is something with the browser here or something like that. The port is on the exceptions list of the firewall but I've even disabled the firewall with no changes. I can load applets from other hosts, but I can't pointing to my machine, so I don't know if is windows, tomcat, or whatever. Please help!
I'm using Tomcat 5.5, JK 1.6 and Windows Vista as server. Using the 2000 port which is on the exceptions list in the firewall. I have also IIS7, but it gives no problems. I mean if I do http://myhost (port 80) the IIS7 initial page shows, but if I use http://myhost:2000 (which is the port configured in Tomcat) then can't find the page. I don't know if is something on the firewall, on the tomcat, or what ever.
Please help!

Answer 1

I've seen this sort of thing happen when the server is misconfigured and reports the content MIME type incorrectly.
I'd suggest using a tool like curl or the Firefox LiveHeaders extension, to confirm that that's correct.