It seems to be a region related issue. I'm having the same issue, for hours now (from Europe), and it seems I can't access neither to the website nor into the viewer (be it Firestorm or SL viewer). Have a friend from Australia who had the same issue as well, while others from the US, could log in without problems.
Was gonna open a ticket, since in the grid status it seems everything is working fine, but, being unable to open anything SL related except for the forums, gives me little options to choose from.
I guess at this point the last thing to do is to wait and see.