Servers rebooting without user consent
We have a group of servers which are rebooting automatically after being patched. The servers are part of a group policy that has the "No auto-restart for scheduled Automatic Updates installations" set to enabled. They don't restart right away, but instead wait for someone to log into the server. Most of the time the servers begin the reboot right after the credentials are entered, but some analysts claim they also reboot several minutes after logging in.
The group policy is enforced through active directory. There are no local policies set at all in regards to automatic updates.
We are patching using SMS2003 or Shavlik.