Windows 7 Pro Opsys
We have a local network with workstations and servers in a W2003 domain. The workstations are going to move to another AD domain (controlled by others) but still need access to the local servers in the original AD domain. Note that these servers may also move elsewhere soon with a consequent change of IP.
The problem I have is that PCs in the new domain have greyed out DNS Suffix Search order (with a number of domain entries) so I can't put our existing server domain in the list (at least via the GUI in the networking section as per normal). When someone tries to access a server by its hostname rather than FQDN, resolution fails as it goes through the greyed out list and fails to match the servers name with any domain.
Why/how is the DNS Suffix search list greyed out and how can I add the server domain to the DNS suffix list?