Airtunes failes in 10.4.11 with -3256 unknown error - firewall not blocking

Until this morning I was able to connect to three remote airtunes speakers from my MBP running the latest iTunes. I'm on 10.4.11, and the firewall is configured to allow both UDP and the iTunes Music sharing.
Any idea what's changed?

I have exactly the same problem on OSX 10.4.11 and Safari 3. Outgoing traffic from Safari 3 is blocked to some non-standard ports, including port 563 that I need to use. I get the same error message as the first poster.
Firewall doesn't help - firewall talks about INCOMING connections, while the problem with Safari 3 and ports is about OUTGOING connections.
This is very similar to what Firefox is doing. Firefox also blocks connections to "nonstandard" ports, but in Firefox, you can manually override it in configuration by going to "about:config" and changing the value of option "network.security.ports.banned.override" and manually entering the port values that you want to access. It then works. (See http://kb.mozillazine.org/Network.security.ports.banned.override for more info.)
In case of Safari 3, I don't see an easily-accessible UI option to enter nonstandard port numbers in some sort of whitelist. So you can say that as of now, if you want to use Safari 3 to access a web app running on some nonstandard port, you just can't do that? Or is there a way in the UI or elsewhere to edit the port whitelist/blacklist?

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