I've been trying to figure out why Apple iTunes software (WinXP version) does not work behind ISA2004. It apparently does most of the functions okay, but when it tries to do a catalog lookup to automatically detect song information it fails. Anyone else run into something like this? I've searched as much as I could and find a lot of complaints that it doesn't work being "corporate" firewalls, but have yet to find anyone who had a solution.