Hello SMB Techguy,   Thank you for choosing Dell. I am sorry, you faced with this issue. To find correct troubleshooting steps for you, may I please ask you to provide more details about the issue: It is connected with OS or switches? Could you please provide OS version or switches models and current firmware?   Please ask me if you have any questions,
Added a couple reservations after ISP router defaulted (ISP pass through setting removed) ...now DHCP list depopulated. No leases, reservations.or scope.  Tried "Authorizing" ...returns.. service can't start. Manage Authorize Servers" has "The specified servers are already present in the directory service.dialog." So, how do I restart DHCP and restore client access to domain?
DHCP service stopped. No Leases ... reservation