I am trying to migrate our Windows NT 4 Domain to Samba 3.0.21b and got the error message below when I run the command: "net rpc vampire -S myPDC -U administrator%mypasswd" Fetching DOMAIN database Failed to fetch domain database: NT_STATUS_ACCESS_DENIED What I want to accomplish is to remove Windows NT 4.0 server as PDC and make Samba our Primary Domain Controller. Looking at Chapter 9 "Migrating NT 4 Domain to Samba 3" on Samba-3 By Example book that it is possible to merge or migrate NT domain to Samba using tdbsam backend. Can someone please point me to the right direction. Thanks in advance.