i have extremely limited options in terms of testing on other devices. i don't have a cell phone and i don't believe in wireless internet. i don't want a wireless network in my apartment. everything is wired. my desktops are all in boxes. i have a very small number of usable laptops.
i tried it on a windows 7 device and it did exactly the same thing.
i think that google is blocking access because somebody tried to hack in and failed. i can't verify that. but it doesn't make sense to me that i would get this error message any other way.