Recently our teams have been alerted to a number of security issues relating to lower level equipment supporting SchemeServe. (http://xenbits.xen.org/xsa/)
I cant tell you what these issues are (for obvious reasons - lets not invite trouble!)
In order to remedy this issue, our servers will be restarted on the night of Monday 2nd March, somewhere in the 2200-0400 time window. The reboot process is quite quick and the servers wont be down for more than a couple of minutes. Its also unlikely that all of our servers will be off at the same time (but possible).
Once this restart is completed, we will evaluate whether the reboot needed on the night of the 3rd March is required any more. If its not, then we'll tell you.