This announcement is for Debian 6.0 (AKA Squeeze / TurnKey 12) users who have not yet upgraded to Debian 7.0 (AKA Wheezy / TurnKey 13):
~# cat /etc/issue.net
Debian GNU/Linux 6.0
Support for security updates to Debian 6.0 officially ended on Saturday May 31 2014.
As you may have heard, for the first time Debian is experimenting with a five year Long Term Support (LTS) program that will extend support until Feb 2016: