Users and groups from trusted domains not available when setting up shares

I am installing some 2003 server machines in preparation for NT - A.D. migration later this year.
When I create a share on these 2003 machines and try to add a user or group from another trusted domain I get the error ...

the specified domain either does not exist or cannot be contacted.

I can browse these domains and connect to shares there and I can connect from those domains to some test open shares on my NT domain. I don't want to use open shares.

What could be the cause of this error?
allsoppAsked:
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oBdACommented:
Assuming you've made sure the trust is two-way, you need complete NetBIOS name resolution.
So you can either use the same WINS server for both domains, or have (at least) one WINS server in each domain, and let them replicate with each other.
Obviously, you need to enable NetBIOS over TCP/IP on your W2k3 machines.
If you can't use WINS for whatever reason, you'll have to revert to an lmhosts file, but that's not really the best solution:
How to write an Lmhosts file for domain validation and other name resolution issues
http://support.microsoft.com/?kbid=180094

And just in case:
How to establish trusts with a Windows NT-based domain in Windows Server 2003
http://support.microsoft.com/?kbid=325874

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allsoppAuthor Commented:
Unfortunately I was not the one who set up this machine initially. I checked trusts and all were fine. So I starged checking WINS and found that the static IP setup had no WINS servers listed at all. I plugged them in and all is well.
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