I have a Dell storage server running Windows Storage Server 2003: it's just
used as a data file server, and is connected to our Windows LAN through a
router. When I turn on ICF the Windows users on the LAN can no longer connect
to its shared folders (though, oddly, the Macintosh users can!).

Turning off ICF cures the problem and, since we have a firewall router, that
may be enough: what do you think? Or should I just wait for the Windows
Server 2003 SP and see if it works with Storage Server as well?