A message from our COO.
At 17:00 UTC today, CCP became aware of a distributed denial-of-service attack (DDoS) against the EVE Online cluster and web servers.
Our policy in such cases is to mobilize a taskforce of internal and external experts to evaluate the situation. At 17:55 UTC, that group concluded that our best course of action was to go completely offline while an exhaustive scan of our entire infrastructure was executed.
While some may feel that such a drastic reaction was not warranted, it is always our approach to err on the side of caution in order to ensure the best possible service for our players and the security of their personal, billing and account information.
We understand the effect this disruption has had for our players and apologize for not having been able to explain fully to the community what was going on. In these cases it can often be counterproductive to containment to give out information while we are in the process of evaluating the scope of any potential problem.
Our taskforce concluded at 22:05 that neither the game servers nor the CCP infrastructure had been breached. Further, we can also confirm that no personal details such as users’ credentials or credit card numbers were exposed through this incident.
The servers were brought back online at 23:00 and we will continue to monitor the situation closely.
Again, we sincerely apologize for this disruption.
Regards,
Jón Hörðdal
Chief Operating Officer
Right, most of the Info are from Eve-online facebook page, on what just happen

Its not MCMC block us from Iceland or what other imaginative ideas you might have that thought of having

1)
QUOTE
EVE Online and related services are currently offline and will return as soon as possible following investigation of some issues.
2)
QUOTE
EVE Online and related services experienced an Internet attack. We have taken them down as a security precaution until further notice.
3)
QUOTE
At 17:00 GMT today, CCP became aware of a distributed denial-of-service attack (DDoS) attack against the EVE Online cluster and web servers.
Immediately, these services were taken offline. As an added precaution all of CCP's infrastructure was disconnected from the public Internet. <more...>
Somehow, the server got flooded

Right, if i were to speculate who did it, it cud be LulzSec... but they hack servers... this is just a flood attack

But can't say lar cuz, it could be "Step One" in the book of hackers for getting into the server... but CCP Pull Plug... literally

cant say when it be up, the time i wrote this post its like 5am, and its still down.... sooo.... REAL LIFE TIME! <3
=After Reading Eve-News24=
Lulsec did it.... right.... im done trollin around on whats happening =_=
Evenews24 Link
LULSEC TWIITER PAGELULSEC Website 
Oh it seem not just eve-online.....
QUOTE(@LulzSec)
And that concludes our DDoS party: Escapist Magazine, Eve Online, Minecraft, League of Legends + 8 phone requests. #TitanicTakeoverTuesday
QUOTE(@LulzSec)
Silly Eve have taken their entire network offline after our very simple DDoS attack. Oh well, another day, another lulz!
QUOTE(@LulzSec)
@EveOnline our boats sunk your inferior spaceships, ujelly?

Uh somehow Garmon rage at LulzSec...
» Click to show Spoiler - click again to hide... «
QUOTE(@Garmon123)
@LulzSec @EveOnline Hey retard i have ur ip adress and im going 2 come 2 ur house irl with a meat cleaver and f***ING f*** U UP
QUOTE(@Garmon123)
@LulzSec @EveOnline AND CHOP U UP AND FEED U TO MY DOGS + ILL GET MY DOGS TO RAPE UR MOM AND SEE HOW U f***ING LIKE THAT U f***ING f***ER
After a few minutes.....
QUOTE(@LulzSec)
Dear angry gamers claiming we just DDoS:
http://t.co/uApVTMB ujelly gamers? Also, taking phonecalls on 614-LULZSEC right now.
QUOTE(@LulzSec)
Now accepting calls from true lulz fans - let's all laugh together at butthurt gamers. 614-LULZSEC, accepting as many as we can, let's roll.