Leopard to Leopard OK but Leopard to Tiger or Tiger to Leopard - error 8

I had a successful test this morning here in Tokyo on a Leopard to Leopard basis. Previously Tiger was OK i.e. Tiger to Tiger now Leopard to Tiger and vice-versa does not work. Any ideas how to get iChat AV working Leopard to Tiger ? What has changed ? Has anyone had a successful test of Leopard to Tiger out there ?
Thanks as ever,
Charles

Hi,
Leopard to Tiger in either direction works.
However it can depend on the way ports are opened in the modem or router.
If this is with Port Forwarding iChat 3 needs 31 settings.
Not all devices have tables big enough for this so people may have picked the lower numbers from the grop of twenty as 1-1 chats only require 4 of these ports.
iChat 4 uses port 16402 for all Vid and Audio parts of the chat and moves DOWNWARDS one port at a time for 10 ports if it can not get a connection.
As you can see there is a potential for a gap.
So ichat 3 users who wish to do AIM Text chats
(port 5190 on UDP and TCP = 2 entries), Bonjour (5297, 5298, 5353 on UDP and 5298 on UDP = 4 entries), Jabber (5220, 5222, 5223 on TCP = 3 entries) and A/V chats ( 5678 for invite, 5060, for negotiation, 16384-16403 for the Chats on UDP = 22 entries)
that can not make that many move to using as many as they can in the range used by iChat 4 (16393-16402)
10:52 AM Sunday; November 11, 2007

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