I am trying to set up a BDC for our PDC. Our PDC is set up on Win NT server and I am trying to set up a BDC on Win 2K advance. I can see the BDC on the PDC but I can't connect to the PDC from the BDC. And a more pressing problem is that when I am configuring Active Directory I get an error ("The domain is not an active directory domain,or an Active directory domain controller for the domain could not be contacted.) Our domain uses underscores which is no longer supported by win 2K active directory. How do I resolve this situation. The outcome is that we will promote this BDC to the PDC but only after we have everything in place. I have read some of the material on migration to server 2003 but the migration plan is to stay with win 2000 advance. PLEASE HELP. %-)