Problem Accessing shares in a different domain

[Stuart_C]

At work we use two seperate domains connected through a router (ISA box).
In each domain the users have the same username and password (there are bout 20 users on our Finance network who connect into the accademic network for internet access/E-mail etc) though obviously the domain differs, e.g. username: domain1\administrator Password: Password and Username: domain2\administrator Password: Password

When I log into a machine and try and access a share in the other domain it will work perfectly if the share is on a Domain Controller, type in the share and away I go. If the share is on any other machine I am prompted for a username and password and I have to enter my username/password for the other domain with the other domian prefix. This includes workstations and member servers (all win 2K3) which is a major problem when I need to put in shares to the member servers.

Any idea why it does this and how I stop it? It is causing problems with a login script as I have to use.

[rob_f]

Do you have a trust relationship between the two domains? If so, what type is it?

[Stuart_C]

None.
Though if that's the problem why does it allow me to connect to shares on the DC's without prompting for passwords but not other machines?