dummy and helpless :'-(

A have a DsfW server (oes 11) with the ip and a normal DNS server (OES 2 SP3) with ip The name of the domain is domain.company.

When I ad a client to domain I give the device as DNS server the ip (DsfW Server) and it joined the domain (domain.company). Then I restart the device and become trouble when the DNS server (DsfW) I dont get any DNS lookup results. If I change the DNS server to (normal dns server) I get dns lookup results., but users couldn't join the domain.

Is there a way to fix this with a forwarding or something?

Regards, Ludger