Accessing file share cross forest

I have a file share in a resource forest, which users in another forest need to access.
There is a two-way trust between the two forests.

If I create the share with Read permission to Everyone, on a memberserver in the resource forest, then it's not possible to access the share at all.

If I create the share with Read permission to Everyone, on a DC in the resource forest, then I can access the share from, but inly from a DC in the user forest, and only with admin credentials from the resource forest.

What must I do to allow a plain users to access a share on another forest, without any logon prompt?

Regards
Kasper K
Kasper KatzmannSeniorkonsulentAsked:
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Wouter MakkinjeConnect With a Mentor IT ManagerCommented:
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Kasper KatzmannSeniorkonsulentAuthor Commented:
Sorry for the late respons. Something urgent came up.

The most I get of this, is that port 445 must be open against the whole user forest network.
I've asked our network guys to open up at monday.

i'll be back.
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Kasper KatzmannSeniorkonsulentAuthor Commented:
It was port 445 that needed a wider opening.
Thanks for helping.

/Kasper
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