Sorry I'm (very) late to the party, but I also live outside the US and have a 1713. Although I too get a blank page going straight to IP address in the browser, I found full interface at /MainZone/index.html. I also get a setup config interface at /SETUP/f_setup.asp.
It seems to me that Denon omitted the first screen as it has the zone1-zone2 buttons in the US versions, but kept the rest.
I'm inquiring Denon UK support about this issue - after all, functionality is one web link away from the empty page, and working. Also they've got web control listed in the specs at UK site. I hope they'll make a new welcome page in a firmware upgrade.
EDT: Also, maybe this could be added to the xx13 F.A.Q. - these web adresses could prove very useful for non-US users, and this forum is the best source for AVR info both inside and outside US anyway...