if pdc emulator failed what happend? if rid master failed what happend?

Hi Muppuri, If PDC Role is unavailable, you cannot change passwords on clients that do not have Active Directory client software installed. If RID Role is unavailable, domain controllers cannot create new directory objects as each of their individual RID pools is depleted. Please refer to the following article: What to do with FSMO roles... http://blogs.technet.com/b/bpuhl/archive/2005/12/07/415761.aspx Brent Hu, TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. ”