Tranquility emergency reboot on Sunday, March 18 (http://community.eveonline.com/news.asp?a=single&nid=4936&tid=1)
18 March 2012, 3:00 pm
Tranquility will undergo an emergency reboot at 15:10 UTC to resolve issues with players being unable to log in. The downtime should last for no longer than 15 minutes so we expect to return to service by 15:25 UTC. A forum thread is available here (https://forums.eveonline.com/default.aspx?g=posts&t=83012&find=unread) should there be any further updates.
Source: eveonline.com | news from EVE (http://www.eveonline.com/)