Users of our accounting server have a couple of times gotten odd errors about communication and unable to access SQL resources. When it happens it happens to all of our users at once. My first thought was maybe the SQL Server is out of whack but event logs for it look fine and no issues with the maintenance tasks that are scheduled.
The server does appear to be seeing an IP address conflict however at intermittent times that seem fairly close to the incidents. The MAC address is one of our laptops. All of our equipment excepting the usual stuff is DHCP, double checked and the server address is on the exception list so it should not be handing out at all. I've seen it where our VPN users had trouble because their LAN was on the same range as our LAN and their router wouldn't let them access our network because it thought everything was local but never the other way around. Has anybody ever seen this behavior where a remote LAN gave interference with the Local LAN?