Trust relationship doesn't work.nltest shown RPC_S_SERVER_UNAVAILABLE

I have one 2003 server and one 2000 server .
when I want to create a trust relationship it always shown PRC SERVER
UNAVAILABLE.
I check DNS. it's OK
and I use netdom to create a twoway relationship ,I can create the
trust but when i want to verify
same error happen
then use nltest to check in 2000 Server
nltest /sc_query NERR sucess
nltest /sc_reset NERR sucess
nltest /sc_verufy NERR sucess
nltest /dcliist will show SEC_E_SECURITY_QOS_FAILED an
ERROR_NO_BROSWER_SERVERS FOUND
and the trust relationship still not working,what should I do next??
Thousand Thanks For any suggestions.Thanks

It could be the name resolution issue. Make sure primary DNS and 2nd DNS servers point to each other as primary and themselves as secondary. This link may help.

Domain Trusts
I played around with "Active Directory Domains and Trusts" but the domains
can't see each other. ...
www.chicagotech.net/domain%20trusts.htm

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
"Richard" <(E-Mail Removed)> wrote in message news:(E-Mail Removed) ups.com...
I have one 2003 server and one 2000 server .
when I want to create a trust relationship it always shown PRC SERVER
UNAVAILABLE.
I check DNS. it's OK
and I use netdom to create a twoway relationship ,I can create the
trust but when i want to verify
same error happen
then use nltest to check in 2000 Server
nltest /sc_query NERR sucess
nltest /sc_reset NERR sucess
nltest /sc_verufy NERR sucess
nltest /dcliist will show SEC_E_SECURITY_QOS_FAILED an
ERROR_NO_BROSWER_SERVERS FOUND
and the trust relationship still not working,what should I do next??
Thousand Thanks For any suggestions.Thanks

Thanks for the suggestion
I check the DNS the two domain can ping each other and set secondary
zone on each other.
the trust still can't create.sometime the error RPC Server UNAVILABLE
shown.