Joining domain you may enter correct domain and administrator account data, but finally get an error:
"Unable to create offline join information"
View into ADSI users and computers applet on the domain controller shows, that computer account was created and is already listed, but the victim machine still isn’t joined to domain.
(Possible) resolution: check for any anti virus software running on the machine to be joined. In our case it was McAfee – once we’ve disabled it, the join succeeded immediately, and we enjoy