Sounds like a "one way trust" problem to me.
Have not got a clue how to resolve this one but I would be interested in reading any replies from others who may have solved this in the past.

There MUST be someone out there who has had this one before. Some of the readers of this board run fairly complex networks.

Here's hoping.
Rgds

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Don Davidson
Network Engineer
http://www.insight-media.co.uk