IP address registered for server is wrong
Our server has several network cards. If you ping the server name, you get the wrong IP address (instead of the management IP you get the IP address of the internet facing address, which is not routed internally). First, I removed the "register this connection's address in DNS" option in the network card, and ipconfig /register DNS. This worked for 1 day, but after 1 day the old IP address came back again. Fix: In DHCP, make a reservation for the address lease. In properties, remove the tickbox "Enable DNS Dynamic updates". Problem solved!