I have an Exchange 2010 Edge Transport server in my DMZ that is configured to use the 'Network Card settings' with ‘All available ipv4’ on External and Internal DNS Lookup Settings. Everything is running fine, however, I have added a new External DNS server in my environment and I want to change the Edge Server’s Preferred DNS Server settings to reflect the new DNS server, and move the old DNS server as an Alternate.
My Problem: After I make the DNS change on the Adaptor settings, the server forces me to re-boot and afterwards reverts it back to the original IP settings. What is causing this and how can I get around it? All I am trying to do is point the NIC IP address on the Edge Server to the new External DNS server and it is not letting me.