additional domain controller

i am adding a additional domain controller to the domain: haydensd.re1 . error.. the domain haydensd.re1 is not an active directory domain, or an active directory domain controller for the domain could not be contacted… if i take off the suffix the wizard continues, and allows me to search. the browse button finds the correct domain but will not allow to continue. if i remove the suffix again a dialog box says: the domain name “haydensd” refers to the domain “haydensd.re1. is that what you intended? but then i get operation failed because: failed finding a suitable domain controller for the domain. “the specified domain either does not exist or could not be contacted.” any ideas?????????? thanks in advance