1. Check for network connectivity.
2. Verify your DNS server IP addresses are correct and in order.
3. Ping the IP address of the host you are trying to get to (if it is known).
4. Find out what DNS server is being used with nslookup.
5. Check your DNS suffix.
6. Make sure that your DNS settings are configured to pull the DNS IP from the DHCP server.
7. Release and renew your DHCP Server IP address (and DNS information).
8. Check the DNS Server and restart services or reboot if necessary.
9. Reboot your small office / home DNS router.
10. Contact your ISP.
DNS resolution is a critical piece of our network infrastructure and it must work properly for our network applications to function.