Cannot access shares from a different forest

Source: Microsoft Support

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1. Has two domains:�
����i. chamelean.local which contains one Dc named server1�
����ii. actionclaims.local which also contains one dc names server2
2. Both the domains are in different forest.
3. Not able to access the shares from both the domains.

While accessing the server1 from server2 we are getting the following error message:�

\\server1 is not accessible. You might not have permission to use the network resource. Contact the administrator of this server to find out�if�you have access permissions.

There are currently no logon servers available to service the logon request.

I checked that there is an external trust b/w these two domains.
I tried validating the trust we got the following error message:

Windows cannot find a domain controller for the actionclaims.local domain. Verify that a DC is available and then try again.

1. We tried pinging both the domains it was not pinging using FQDN.
2. I created a secondary zone on chamelean.local domain for actionclaims.local and then created a secondary zone on actionclaims.local for chamelean.local.
3. Then we were able to ping using FQDN.
4. Then we were able to access the shares from both the domains.
5. Issue resolved.