I currently have a 2000 domain, i run the forestprep and domain prep of the 2003 media to update my schema to support 2003. I have a few 2003 sp1 domain controllers and don't have a problem. when i try to added a 2003 sp2 domain controller, dcpromo runs completely without errors. but replications doens't work and the domain controller will not authenticate logins. is there something different that must be done to support sp2.