Some of the older debian servers are firewalled using a command in the /etc/network/interfaces file to load the iptables rules. For some reason this breaks the file on upgrade to Debian wheezy and the network interfaces don't come up on boot. To fix, comment or remove the line:
pre-up iptables-restore < /etc/iptables.conf
and use the iptables-persistent package instead.
Also gives an error on
INPUT -i ! lo
Need to change to
INPUT ! -i lo
(To be fair, this has been deprecated for a while now)
php5-suhosin has been removed from wheezy. The upgrade sort of removes it, but it hangs around as a remove candidate package. Following http://pc-freak.net/blog/how-to-get-rid-of-php-warning-php-startup-unable-to-load-dynamic-library-usrlibphp520090626suhosin-so-on-debian-gnu-linux/ we check the package status with
dpkg -l | grep -i suhosin
and remove with
dpkg --purge php5-suhosin
This seems to fix the problem (don't get emailed every so often by cron about it missing)
For next upgrade should remove it first.
Make sure the generic kernel package is installed - have tended to choose the specific one in the past for no good reason.
apt-get install linux-image-amd64
This should ensure the 3.2 kernel is installed as part of the upgrade.