Yep, it has been online for a whole year with 99.9% uptime; the biggest attack in the past resulted in a 30 minutes shutdown.
Which is why seeing how it has now been offline for a whole day is quite panicking. Even their Twitter feed halted:
https://twitter.com/TheRebirth_WoW
And it looks like all of the other classic private servers are down, too!
Scriptcraft: No more activity, awaiting the merge with Valkyrie.
Valkyrie: Server has been offline since yesterday.
Q-Gaming: Closed.
Feenix: Being attacked and shut down since yesterday.
TheRebirth: No response from the website, server offline.