I have a SBS2008 and a sonicwall NSA240. The SBS is our DNS server and the Sonicwall is our DHCP server. All the PCs are joined to the domain and accessing data as needed. I noticed that our remote location was unable to RDP any of the PCs by name and then discovered that none of the PCs (with exception of the server) are listed/registered in DNS. They must have been registered at one time, but they no longer are. How to I get the PCs to register to DNS. What would cause them to vanish from the list?