Accessing Navision database across domain

Is it possible to access a Navision database (4.02) across domains?

I am in the process of moving my endusers from one domain to another, but I can’t interrupt their Navision access. If I try to access the database through the server name or IP address I receive the following error:

The TCP/IP connection’s ‘host’ is not answering (TCP/IP error ECONNREFUSED).

I have added the server to the hosts file already, and that did not work.

What else can I do to connect?

-jj