Hi, I've had this problem since I first tried to share any content between libraries with iTunes 9. In fact, I noticed the same problem when I was trying to stream content to my Apple TV a couple of weeks ago. So I have an iMac, MacBook Pro and Airport Extreme (802.11n) Base Station. Both Macs have Snow Leopard installed with iTunes 9. None have any third-party firewall software installed nor do they have the firewall turned on in System Preferences. Here's the problem: when I try to share content from library to library, it doesn't happen. Specifically, I can initialise a connection between both computers so the other computer's library shows up in the sidebar in iTunes, but that's as far as it gets. When I click on said library, there's a 2 minute wait before the following message is displayed. "The shared library "Liam's Music" is not responding. (-3259) Check that any firewall software running on either the shared computer or this computer has been set to allow communication on port 3689." I've tried absolutely everything (including a direct Ethernet connection between both Macs- same error message). Most recently, I even verified port 3689 is open using the Network Activity app. If anybody could help me here, I would really appreciate it. I have so much content I want to share to my family's iPods, etc. Liam.