Hello,
all of my SL 6.2 machines proposed today a kernel update to 2.6.32-279.1.1.el6, which would probably make them unreachable after reboot. This kernel is also included in the 6.3 release.
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[root@dano ~]# cat /etc/redhat-release
Scientific Linux release 6.2 (Carbon)
[root@dano ~]# yum check-update
Loaded plugins: security
kernel.x86_64 2.6.32-279.1.1.el6 sl-security
kernel-firmware.noarch 2.6.32-279.1.1.el6 sl-security
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http://bugs.centos.org/view.php?id=5816https://bugzilla.redhat.com/show_bug.cgi?id=837227http://rhn.redhat.com/errata/RHBA-2012-1104.html
dano