Apple TV no longer connects to Airport Network

Question

I operate an Airport WDS network composed of 2 A. Extremes and 1 A. Express. Several Macs (10.4.11) are connected to the network. So far, the Apple TV used to work fine.
Added a new iMac running 10.5.1. Everything works fine EXCEPT the Apple Network which sees the network but cannot connect to it (Error -3) when I enter the network pwd. Still, this pwd works for every other computer.
I tried everything on the ATV, including a complete reset ("menu" + "-" keys on the remote). Same error again and again.
ATV diags say the device is ok.
How could this be related to my adding one single Leopard computer on the network?
Any ideas or suggestions?
Thanks,

Answer 1

Here's what I found and how to get it working again.
What I found: The TV has network address that is wrong (not the same subnet) as the host mac running iTunes.
The fix - and this depends on your network configuration - you must ensure both Tv and the host computer have acquired IP addresses on the same subnet, say 10.1.1.x and 10.1.1.x+1, or 192.168.2.x and 192.168.2.x+1.. Otherwise iTunes will not connect to the TV.
You will have to force this by setting the IP addresses manually, as I have done.
The clues....
I first looked at the TV to find its network address and tried to ping that from the mac (use the Network utility or the Terminal). This failed which immediately implies the IP addressing is all screwed up.
In my case I have my iMac directly connected to the AppleTV via a wired ethernet connection.
From the iMac to my ADSL is wireless (Airport), and this internet connection is shared to the ethernet connection.
The TV was configured to use DHCP and the network settings shows it expected to find the iMac at 192.168.2.1, ditto the DNS and router.
What I discovered is this. Turn on the TV screen and set TV to show its network settings, then shut down the iMac. In my case ATV then shows N/A for all the IP addresses.
As the iMac is rebooted, the TV is assigned an address in the 192.168.x.x range, and is given 192.168.2.1 for the DNS and router in this range also.
But if I open the iMac's network panel it has self-assigned an address in the 168.x.x.x range, so its no wonder the TV and iMac are not communicating - they cannot because they aren't in the same subnet.
In my case:
iMac: open the network control panel, and set the IP address to "Manual with DHCP". Assign an address - I used 192.168.2.1.
TV: set the network settings to manually adopt an address of say 192.168.2.4, and set it to look for the router and DNS (the iMac) at the iMacs address as above.
Hey presto TV and iMac connect again.
I'm not sure whether the TV or Leopard is at fault, but that I had it working fine in Tiger and that in Leopard, ping failed with the error "unable to allocate resources" leaves me to suspect Leopard is at fault.
Message was edited by: iLuxo
Message was edited by: iLuxo