I used a binary package for i686 from the nightlies, mt-daapd_0.9-svn-1586_etch_i386.deb
As far as I know theres no firewall on either the client or the server. The client is XP SP2 with the latest iTunes (7.3.1.3). The server is almost a basic install of Debian 4.0.
iTunes prefs is set to look for shared libraries.
Everything is connected with a wired connection. The same server is sharing Samba shares to the same computer, and that works fine.