Dear Team,

In my organization I am trying to add one Windows 7 Pro 64- bit to my Domain controller its a SBS 2011 that acts as a DC, DNS and Exchange server.

From the client PC I am able to ping with DC, RDP also working while doing NSLOOKUP in client PC it showing correct server name and its IP address.

What will be the possible problem in this case.

Waiting for kind response.

Please try the SBS forum for help.  This forum is for the virtualization product Virtual Server 2005.

Specifically: http://social.technet.microsoft.com/Forums/en-US/1963ef92-4d9b-458b-b4a6-78afd2a92a48/help-adding-backup-domain-controller-to-sbs-2011-essentials