Microsoft Forests file sharing issues,across multiple Forests.

We have an issue sharing replicated files across Distributed File System (DFS) servers all in the same Microsoft AD Forest. The issues is when users in different Forests try to use the files they are not able to. The users in the other Forests can see the shares, but when they click on the directory, the share will not open, and an error saying they do no have rights pops up.
  Our MCSE cannot figure out the issue. We "think" we have a Forest Trust setup between the various Microsoft AD Forests. I think we need a methodology to start at the beginning and work our way through to determine the issue.
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SandeshdubeyConnect With a Mentor Senior Server EngineerCommented:
You need to check the trust relationship between the forest.
Check the DNS forwarders and zone setting.
Check the permission on the share and group membership.

Refer this link for trust and dNS zone configurtion between the forest:

To enable Resource Access Across Forests refer this link:
"We "think" we have a Forest Trust setup between the various Microsoft AD Forests"

Well the first thing I would do is verify the trust:
"netdom trust /d:domainname /verify /twoway"
"netdom trust /d:domainname /verify"
if it is only a oneway trust
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