1. Tried to create a secondary zone on both sides, failed loading zone from master

2. Tried to create a trust (realalm and forest) , on both sides, but it fail validation, no logon servers available

Firewall a pass-all rule on bothe servers

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You need to configure conditional forwarding on the DNS on each side of the trust so they can locate AD in the remote Active Directory.
vss-ptAuthor Commented:
I Just create a condition forwarding?
No need for a secondary zone?

If domain A is called domainA.local and domain B is called domainB.local, you'd do the following:

In domain A, create conditional forwarding to domain B, and enter it's DNS servers.
In domain B, create conditional forwarding to domain A, and enter it's DNS servers.

I'm assuming routing is okay between the two networks already for this to work.
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vss-ptAuthor Commented:
Thanks, Now I'm going somewere !!

Step to also with no problema. I created the forest trust on Domain A for both domains.

On Domain A I can see the 'all users' shares from domain B. But how do I Grant a share to a user of domain A on domain B?
Just because a trust exists, you still have to deal with permissions.  So for users in each domain to access something like file shares you would have to create the appropriate groups and nest them in the other domain, etc to provide access.

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vss-ptAuthor Commented:
I will open another thread. I can´t see domain A user on domain B to deal with permition
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