Resolved as of 2013-04-26 10:53:00
Part of wireless network on the 4th floor of Soda hall was down from 10:42am to 10:53am because that UPS failed during the power UPS testing from the electrician. Those APs are back on around 10:53am. Sorry for the inconvenience that this may cause. If you still experience any wireless issue in that area, please report to help@eecs