Last night a Windows Server 2008 R2 machine I maintain automatically rebooted after installing updates, without starting the DNS service. Since the machine is the network's DNS server, I got a call in the morning to say the Internet was down.
This has happened several times; I log in, manually start the service, everything is fine. But I can't figure out why this is happening.
The DNS Service is set for Automatic (not disabled), so it's not that.
When I look in the Event Viewer, it doesn't seem like there was even an attempt to start DNS; there are no error messages for DNS.
Any pointers on other events to look for (the logs are so noisy) would be appreciated.
This is a small office LAN, nothing fancy, the server is a DC. I don't believe there is anything unusual about the setup but I'll be happy to provide any additional information that might be relevant.