I recently did some troubleshooting in an Active Directory environment. A power outage had just occurred, and suddenly some workstations were unable to find a logon server even though I could ping a properly-functioning server from them.
The clue appeared in the IP configuration: the DNS suffix and the DNS servers were gone. The router responsible for DHCP had somehow lost those items; it was using a blank DNS suffix and Google's DNS servers. That explained why only some machines were affected - laptops (not affected by short power outages) didn't get a new DHCP lease because they didn't reboot.
When I restored those settings and ran ipconfig /renew and ipconfig /flushdns on the affected machines, everything started working again.
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