Were your servers built using a "cloning" process, like symantec (norton) Ghost? If so they all may have the same SID, (BIG BIG problems for an NT network security wise...) Ghost comes with a utility to chaneg the SID of a nt/2k machine, but it MUST NOT be a member of a domain, as that causes all sorts of problems, so you'd have to switch it to workgroup, run the sidwalker (ghstwalk) from DOS and then re-join it to a domain if you're using one.