The following error occurred attempting to join the domain "MIRTH": An attempt to resolve the DNS name of a domain controller in the domain being joined has failed. Please verify this client is configured to reach a DNS server that can resolve DNS names in the target domain. For information a about network troublishooting, see Windows Help.

Check the DNS ip address entries on the client, make sure they match your domain controller(s) ip addresses, might want to verify this by doing a ping against the domain controlers. Check if your domain contollers are online and replicating correctly (run dcdiag & other AD admin tools).

After you check your client DNS settings (they should point to your internal DNS servers hosting the AD zone), try using the fully qualified name (FQDN) of the domain, such as mirth.com, or whatever your domain is called. If you simply type MIRTH, the computer will attempt to resolve this NetBIOS name. "Mirth" on its own is not a FQDN. If you choose to use NetBIOS names, you'll need your clients to be able to resolve them using NetBIOS name resolution options (broadcast, LMHOSTS file, WINS server).Visit: anITKB.com, an IT Knowledge Base.