Status 74.72.57.5 - Default Gateway 74.75.56.1 - DNS1 24.26.103.15 - DNS2 24.29.106.16
If I am interperating this right, you have outside servers as your preferred DNS server. All nics on your LAN should have your DNS server as its preferred DNS server. Then, either forwarders or root hints should carry the query to outside servers.
DNS1 24.26.103.15 - DNS2 24.29.106.16
In other words, these above DNS servers should not be your preferred DNS servers for any of your computers on the LAN. So, on fixed IPs you have to manually configure your server as the preferred DNS server. For DHCP clients, you go into the DHCP snapin>>scope options, and configure DNS servers to be your DNS server.
The reason you are having problems with contacting your server is you are looking to an outside server for DNS resolution.