applying permissions emc storage

I'm trying to add my domain users (In the "Security TAB") to a folder that reside on an EMC Storage, but when i try to select users, i can only select them from the local server on which the folder is in.
Example, adding users to a folder in \\EMCServer\Myfolder (Mydomain.com) will give me only users from EMCServer and not from Mydomain.com
On other non-EMC shares it works fine.
Anyone ?