My Hypervisor doesn't shut down correctly stating ISCSI errors when I send it for a reboot and I have to hard reboot it.
Issue the following commands at the hypervisor which should stop it causing issues in future:
chkconfig --level 06 network off
rm -rf /etc/rc0.d/*network
rm -rf /etc/rc6.d/*network
This is usually caused by a shut down or restart of the hypervisor that did not give the ISCSI service enough time to stop correctly.