(Answer) (Category) VNC FAQ-o-Matic : (Category) VNC Basics :
What does the "Java.net:NoRouteToHost" error mean?
This error is very common when you are using the Web-Browser 
VNC Viewer client to connect to a VNC Server which is situated
behind a firewall/router.

There's not much you can do to fix it on the Viewer side of
the connection, except perhaps by trying to connect with the 
standalone VNC Viewer, rather than via a web-browser. To fix
the VNC Server side of the connection, see this FAQ:

(Xref) How should I setup my firewall to work with VNC?
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