Accessing Shares Across Forests

Using 2008 r2 servers in 2003 functional levels.
I have two domains in two separate forests.
Created stub forward lookup zones on each domain’s DNS Server.
I setup a one way trust so that A trusts B.
Domain A has shares that users in Domain B need to access.
I am able to assign rights on shares in domain A to global groups and universal groups in domain B.

When I try to map a drive from Domain B user to Domain A resource, I get the following: “System error 86. Specified network password not correct.”

When I try to setup conditional forwarders on each DNS server for each domain, I get “the server with this IP address is not authoritative for the required zone.” But it actually is!

What am I missing?