This Knowledgebase article provides information about when DNS service had been removed from an Exchange server, network cards loopback addresses must be removed.
If you are removing the DNS Service from the server hosting Exchange and relocating it to a new server, then you must update the IP address stored in the DNS field for each of the network cards in the machine. Please follow the steps detailed below.
Failure to perform these steps can result in problems copying the backup file across the channel during the install. Microsoft Exchange System Attendant will also fail to start because it will fail to find the DNS server.
- Via 'My Network', select 'Properties'.
- For each network card in turn, select 'Properties' and then select the 'TCP/IP protocol'.
- Right-click and select 'Properties'.
- Under the DNS setting, change the 127.0.0.1 address to the new IP address for the DNS server.
Note: For the channel network cards, simply remove the 127.0.0.1 address because they do not need to know the new DNS server's IP.