Kinda strange, I am watching my Mag254 right now. I had the same blocked message since yesterday but tried a reboot maybe 20 minutes ago and it booted normally. Considering its working, I have not done any more reboots, I suppose its possible I got in during a brief open perioid, don't know. Others have confirmed they also have booted successfull. Its hard to say, but things are changing, be patient and try again once and a while. For the record, I have not yet linked my Mac address.
Hopefully, folks didn't go changing a bunch of settings during the server outage period.