Problem with NetBT when checkin network between domancontroller and member server.

I am trying to setup a Exchange server, but when I install windows 2003
Std, install it into the domain and run the netdiag command from the
support tools I get the following error message:

Redir and Browser test . . . . . . : Failed
List of NetBt transports currently bound to the Redir
NetBT_Tcpip_{35235261-4F0D-401D-9758-262573B86D81}
The redir is bound to 1 NetBt transport.

List of NetBt transports currently bound to the browser
NetBT_Tcpip_{35235261-4F0D-401D-9758-262573B86D81}
The browser is bound to 1 NetBt transport.
[FATAL] Cannot send mailslot message to '\\ME*\MAILSLOT\NET\NETLOGON'
via redir. [ERROR_BAD_NETPATH]


The domain controller and the server are located on different subnets with
a firewall in between. Any help would be appreciated.

Håvard