We have a simple configuration.
Server 2008 R2, File Server, Domain Controller, DHCP Server.
Terminal Server (Citrix), Server 2008 R2.
Exchange Server 2007.
We changed ISP recently, and now internet connection on the File Server is extremely slow, but ok after connecting.
The workstations on the LAN appeared to lose internet connection unless I changed their DNS Primary & Secondary to the DNS server of the new ISP provider, then all is well. Before IP & DNS were obtained automatically.
The primary DNS on the Files Server is 127.0.0.1, Secondary is the IP of the new ISP DNS server.
The DNS cache on the file server has been cleared.
Any ideas as to how to resolve this