On September 22, we will be upgrading our servers to a new kernel which will help mitigate the exploit for CVE-2010-3081(http://bugs.centos.org/view.php?id=4518).
This is scheduled to be done beginning Wednesday 22, 2010 at 10 PM EDT through Thursday 23, 2010 at 4 AM EDT.
While the reboot will take place during a six hour period, this does not mean that your server will be offline for this length of time. A typical reboot should take no longer than 15 – 20 minutes. We do not foresee any further downtime outside of this window. If you do notice any issues after the reboot, please log a Support Ticket.
Note: Emails will be queued in a mail proxy and will be received once your server comes back online. No e-mails will be lost during this maintenance.