I've setup up the Native file access pack on a test NW6 sp5 server. I can
see the server in our Windows Domain but when I access it I get

\\servername is not accessible. An unexpected network error occoured

I have setup a user account in AD and eDIR and can login to both
independently. I get a login prompt if connected as another user but
entering a username and password still gives the above message.

Any pointer much appriciated