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File share over domain trust

Domain A (server 2012 R2) is set up with a one way trust to Domain B (server 2008 R2).  I have a shared folder on Domain A that users from Domain B need to access.  I have added a test user from domain B to the share permissions and the folder ntfs security permissions on Domain A.  Anytime I try to access the share from Domain b I get the error: you do not have permission to access \\machine.xyz.local\fileshare.

Conditional forwarders are set up for each domain.  I also tried to set up a two way trust and I'm getting the same problem.
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Toni Uranjek
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What kind of trust did you create?
Are DomainA and DomainB actually in separate forests?
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jasp101

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Yes.
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Different forests.  It is a one-way external trust.
What are Domain Functional Levels?
What are Forest Functional Levels?
Did you create External trust, which supports only NTLM authentication or Forest trust, which support NTLM and Kerberos authentication?
I've seen your answer regarding type of trust .

Did you try to create one way forest trust?
Both forests should be at Forest Functional Level 2003.
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Both domains are forest level 2008 R2.  I removed the one way external trust and set up a two way forest trust and I am still having the same issue.  I have a user group set up on domain b and added that group to both the share permissions and the ntfs permissions on the share in domain a.
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Toni Uranjek
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i was trying to connect with the same username in both domains.  after trying a different username it worked.