> i had tried but till yet i m fail do fine any document related to this > topic but i can find how you convert dns as root server, do you have any > other solution of this problem, You did not look very hard: http://support.microsoft.com/default.aspx?scid=kb;en-us;229840 http://support.microsoft.com/default.aspx?scid=kb;en-us;298148 http://support.microsoft.com/default.aspx?scid=kb;en-us;300202 http://support.microsoft.com/default.aspx?scid=kb;en-us;291382 Plus a search of google.com turns up a bunch more. John Tolmachoff MCSE, CSSA IT Manager, Network Engineer RelianceSoft, Inc. Fullerton, CA 92835 www.reliancesoft.com