When using the Sharing tab of the Printer Properties dialog in an Active Directory domain, the following error is displayed below the List in the Directory check box:
The Directory operation is still in progress.
This is symptomatic of a DNS problem. Either the DNS server IP address on this computer's TCP/IP properties is incorrect or the DNS server is mis-configured.
NOTE: The DNS server IP address must point to the DNS server that has the DNS zone for the Active Directory.
NOTE: See DNS Namespace Planning.