Bonjour chats - one computer can initiate, another cannot

Two Leopard Macs are on the same AirPort network. Each can see the other in Bonjour iChat pane. However, only one (A) can initiate chats to the other (B).
When B tries to initiate chats to A, it times out with:
"bonjour error, Instant Message connection failed. The other person’s computer may be unreachable."
Even though immediately before and after that, A can successfully initiate chats to B.
Nothing shows up in either computers' Console log when this happens. Nor can I find anything in any other log.
This problem has been going on for... I don't know how long. Hasn't been much of an issue, but I'd like to figure it out. Any ideas where to look?

For the points
As the other suggestion was a lot closer and mine was an alternative that was wide of the mark, I am not sure I earned them that time.
10:06 PM Wednesday; November 11, 2009
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

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