You have installed a snapshot, not a release version. Contrary to release versions, snapshots don't come with a webinsterface preinstalled, offering only ssh access by default (you can then install the webinterface manually via opkg update && opkg install luci).
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It's a matter of principle (and liability) for me not to take administrative (any kind of) access to systems of people I don't know personally (for a long time) - and I don't have personal experience with the U35WF anyways. That aside, this particular remote access solution in question is a software I don't want to run on my premises or within my network.
Got the same problem, inside the .bin archive on the shadow file says no password set. Tried with admin/kimax like in oem firmware won't work also. Any solution?