Did you rename the box? This error is telling me (and I could be wrong here) that you are trying to use the same name which is associated with the SID of the same box when it was a DC in W2K
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of osman filiz Sent: Tuesday, September 16, 2003 2:40 PM To: [EMAIL PROTECTED] Subject: [ActiveDir] Dcpromo Failed On Windows 2003.Urgent!!! We had two domain controllers with w2k sp4 (A and B) then we add a new one with windows 2003(C) .We transfer all of the master roles to this windows 2003 server(A to C). After that we demote one of the windows 2000 domain controllers(A).We installed freshly windows 2003 to A but when we want to promote it fails with this error: 09/16 19:46:16 [INFO] Error - The promotion failed because the name of local computer is the name of a predefined security identifier. Please rename the computer. (8571) 09/16 19:46:31 [INFO] NtdsInstall for gateway.local returned 8571 09/16 19:46:31 [INFO] DsRolepInstallDs returned 8571 Any recommendation? _________________________________________________________________ Add photos to your e-mail with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail List info : http://www.activedir.org/mail_list.htm List FAQ : http://www.activedir.org/list_faq.htm List archive: http://www.mail-archive.com/activedir%40mail.activedir.org/ List info : http://www.activedir.org/mail_list.htm List FAQ : http://www.activedir.org/list_faq.htm List archive: http://www.mail-archive.com/activedir%40mail.activedir.org/