Domain Not found error with One way selective trust

I have two domains with a one way selective trust (external) between them.  We have configured the firewall to allow all ports between the two DC's. The trust authentication works, DNS is working.

When the users in the trusted forest try to access the Citrix servers in the trusting domain (which is all they are allowed to), they get "domain not found' when they put in their domain user name and password.

Any ideas?
Godcom77Asked:
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Godcom77Connect With a Mentor Author Commented:
Fixed this one,  The firewall on the other side was not set to allow connections from the citrix servers
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MaheshArchitectCommented:
On client machines and DCs in trusted domain run below LDAP query and check if it resolves successfully

In command prompt Type nslookup, and then press ENTER.
Type set type=all, and then press ENTER.
Type _ldap._tcp.dc._msdcs.Domain_Name, where Domain_Name is the name of your domain (trusted domain) , and then press ENTER.
if it resolves correctly, run same query with trusting domain name and check if it resolves perfectly
Check below article for more info
http://support.microsoft.com/kb/816587

Also download PortQueryUI tool from Microsoft and check if all AD ports are open as appropriate between source domain and target domain

Also check below link for AD port requirement for domain trust over firewall and verify if all are opened at firewall end
http://support.microsoft.com/kb/179442

Finally do conditional forwarding or secondary zone of both domains for proper name resolution

Mahesh.
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barrykflCommented:
can the client and citrix browse eaxh other ? there dns can really  resovled?

if cross subnet ..is it allow netbios access ?

or try type this \abc.com\administrator to see if ir can access ..

if you want to test if it is firewall issue...try put the client and server on same subet
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