Windows server should NOT decide when to reboot for windows updates!
we have designated maintenance windows for such things! It the OS decides i don't use the server at 09:00 and reboots for pending updates then there will be lots of upset people!
We generally install updates when we can then do the reboots in the maintenance window (as it's quite small on some servers)
Dave Nottingham commented
Setting to DownloadOnly and disabling reboot worked for us on 2016, but two new Server 2019 boxes are ignoring the DownloadOnly setting and are downloading and installing updates. In view of the number of BSOD and boot failures recently we need to ensure there is an additional backup just prior to installing the updates
Sebastian Savard commented
This is a serious issue with Server 2016. We are in a 24/7 situation, and we cannot have servers deciding to reboot even at 4am. We plan maintenance when possible, and manually install updates to servers. We need this functionality back!
Tom Weustink commented
I never understood that as well. in my opinion it's fine if it checks, but as a default that should be it.
Imagine having all your Domain Controllers (which are also you DNS servers) to reboot at the same moment. Even if it is 3am.