Unable to Sync i-Tunes and Apple TV

Question

Hello. I am writing about my inability to sync i-Tunes and Apple TV. I have read a variety of posts in this forum regarding other users' problems with the same issue and have been unable to solve my own based on recommendations, including exchanging my Apple TV for a new one at my local Apple store, which I did.
My Apple TV is linked to my computer through a Linksys wireless router. The Apple TV is able to connect to the internet as demonstrated by its ability to download movie trailers, access YouTube, and get its software updated. It appears in my i-Tunes (version 7.5.0.20) devices list, but each time I click on sync, nothing happens. I get an error message about opening port 3689 because but that port is not blocked. I've shut down my TrendMicro "PC Cillin" firewall and the same message comes up.
So in sum, the Apple TV can link out to the internet but not back to my i-Tunes. Both are running latest software versions. Here's the best part, before I moved a few months ago to my current home, both worked and communicated fine! After I moved and hooked everything back up the way it was, Apple TV didn't work the same (i.e., did not sync with i-Tunes). Thinking it was a problem with Apple TV, I exchanged it for a new one recently. But the new one has the same problem, so it's not the Apple TV unit.
Any help would be much appreciated.
Thanks,
Ronin703
Following are i-Tunes diagnostics notes (everything works fine):
Microsoft Windows XP Professional Service Pack 2 (Build 2600)
IBM 288692U
iTunes 7.5.0.20
CD Driver 2.0.6.1
CD Driver DLL 2.0.6.2
Current user is an administrator.
The current local date and time is 2007-12-08 20:36:02.
Video Display Information:
NVIDIA GeForce FX Go5200
** Network Connectivity Tests **
Network Adapter Information
Adapter Name: {D37BCF82-D40B-4D6C-B3F5-CA69BFEB857E}
Description: 11b/g Wireless LAN Mini PCI Adapter - Packet Scheduler Miniport
IP Address: 192.168.15.101
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.15.1
DHCP Enabled: Yes
DHCP Server: 192.168.15.1
Lease Obtained: Sat Dec 08 11:50:16 2007
Lease Expires: Sun Dec 09 11:50:16 2007
DNS Servers: 192.168.15.1
192.168.15.1
Adapter Name: {0F331AA6-8F06-4491-BE96-BD3DE6F99C04}
Description: Broadcom NetXtreme Gigabit Ethernet - Packet Scheduler Miniport
IP Address: 0.0.0.0
Subnet Mask: 0.0.0.0
Default Gateway:
DHCP Enabled: Yes
DHCP Server: 10.42.2.1
Lease Obtained: Fri Sep 07 10:37:17 2007
Lease Expires: Sat Sep 08 10:37:17 2007
DNS Servers:
Active Connection: LAN Connection
Connected: Yes
Online: Yes
Using Modem: No
Using LAN: Yes
Using Proxy: No
SSL 3.0 Support: Enabled
TLS 1.0 Support: Enabled
Firewall Information
Connection attempt to Apple web site was successful.
Connection attempt to iTunes Store was successful.
Secure connection attempt to iTunes Store was successful.
Secure connection attempt to iPhone activation server was successful.

Answer 1

I had the same problem. I doubt it is the firewall software on your cpu but rather then one on the router itself. On your linksys control panel, go to applications and on the port list enter 3689 to 3689, enter the ip address for your appletv (you can get it from the apple tv or from the DHCP client list under the status tab on the router). Click enable then update. Or, you can simply disable the firewall on the security tab of the router but I would not recommend this. Even after updating, I had to unplug the apple tv to reboot it and then it worked fine.