Yes, per the JackPoint login screen, it appears they are getting in without FastJack's approval:
<020573> Any irregularities seen on the site can be reported, but you can also assume I’m generally aware of them before you are. —Fastjack
Someone tried to hack the network yesterday, make sure that you are using the latest protocols. – FastJack
<032073> I’m not playing games anymore. the situation will be resolved soon. i apologize for the inconvenience. —FastJack
But do any of these actually mention A.Nonymous?
re:
War!
FastJack is not saying there is a problem, just that he'll generally notice them first (because he's smug like that

) Also, A.Nonymous posted in this book, and FJ didn't mention any actual problems here.
re:
ParazoologyJust because someone tried, doesn't mean they got in. This sounds like the standard '
please update your virus check software' line any good admin would promote.
re:
Attitude:
What is he actually referring to? I would expect that if there's a serious issue, FJ would make mention of it near the event (or posting).
A.Nonymous does post in this source, but FJ doesn't mention any issues here?
I'm just not thinking
A.Nonymous is a problem ID. It looks more and more like a legitimate username. Now if the ID instead said:
<User Unknown> then I'm sure all this conjecture would be warranted.
Until then, who says it's anything but an actual legitimate UserID?