OracleVM: a consola vnc não funciona no Oracle VM Manager?

Se a applet java que carrega um cliente vnc não funciona quando carregam na tab "Console" de uma determinada VM e a JVM se queixa do seguinte erro:
load: class VncViewer.class not found.
java.lang.ClassNotFoundException: VncViewer.class
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)
Caused by: java.io.IOException: open HTTP connection failed.
at sun.applet.AppletClassLoader.getBytes(Unknown Source)
at sun.applet.AppletClassLoader.access$100(Unknown Source)
at sun.applet.AppletClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 10 more

Então a solução é simples!

"To enable the console button in Oracle VM Manager, the following rpms need to
be installed depending on which browser you use to access Oracle VM Manager:

The rpms are located at http://oss.oracle.com/oraclevm/manager/RPMS

If you use a Mozilla/Firefox browser on Linux, download the ovm-console rpm and
install it on the machine where your browser is running:

  rpm -i ovm-console-1.0.0-2.i386.rpm   (if on an x86 browser)
or  rpm -i ovm-console-1.0.0-2.x86_64.rpm (if on an x86-64 browser)

This installs an ovm-console plugin into your browser.

If you are not using a Mozilla browser or are not using a browser from Linux
(e.g. you are using a browser on Windows), download and install the
tightvnc-java rpm on the host running Oracle VM Manager:

  rpm -i tightvnc-java-1.3.9-3.noarch.rpm

Please install the tightvnc-java rpm *after* installing Oracle VM Manager.

src rpms for these packages are located at:
  http://oss.oracle.com/oraclevm/manager/SRPMS"

No meu caso, bastou instalar o rpm do tightvnc-java-1.3.9-3.noarch.rpm :o) [firefox em Windows].