I use
http://192.xx8.1.xxx:8090/stanza because I'm using a different port. The IP you give is not really the one your computer is using on the router.
I installed the slideme app store (slideme.org) got the ipbook app from there to get the right host ip right from the Vox. Or you could open a command prompt on your computer and type in ipconfig (the ip is the one near the top that is next to the IPv4 address) or hostname to use that instead.