I have a Windows 2008 Core SP1 box that we use just to serve encryption keys to the network. Yesterday it fell off the network and we were not able to get it back on until we switched it from a static IP to a DHCP address. It was really strange, no matter what we did we could not get this server to communicate on the network unless it has a DHCP address. Once we put the DCHP address on the box, we can see the server and all network resources and the whole network can see the server.
One other thing, I disconnected the server from the network hooked up a 5 port router and 2 other laptops and assigned static IPs to all, and everything could see everything. This told me that it was not an issue with the network card, since it worked when off the domain network. Our network is AD 2008 R2 SP1 with 3 DC's and those are also the DNS Servers on the domain.
Now my boss wants to know why this particular server fell off the network, and he isn't accepting my I don't know answer. Will someone please help me figure out why this happened?
Thanks in advance.