Home sharing firewall problem

I'm trying to set up home sharing between a macbook pro running 10.4.11 and a powermac G4 running 10.5.8.
On the G4 I've set iTunes sharing to allow incoming connections in System Preferences/Security/Firewall, but a look at the log show that the G4's firewall is denying the connection attempt from the Macbook. Going the other way (playing and sharing from the Macbook to the G4) works fine.
I can get it all to work if I turn off the firewall, but obviously I'd rather have the firewall on.
In System Preferences/Sharing on the G4 the computer name was empty. I changed it to Leo to see if it made a difference with the firewall and it didn't. I continued messing around a bit and later I saw an entry in the console (which unfortunately is now overwritten so I don't know exactly what it said) saying something about the computer name and it reassigned a name instead of Leo, "PowerMac-0003938D88-2".
I continued messing around with settings and then when turned the firewall back on it started working properly and allowing the Macbook to connect to iTunes.
After thinking about this overnight, I started thinking this may be connected to another problem I've been having with the G4. I've had ongoing issues with DHCP assigning 169 address. As this machine isn't used as my main computer, everytime I shut it down I've just been deleting the SystemConfiguration folder so when I boot back up I get the correct IP address assigned to be able to be online. This works and is easy so I haven't bothered to investigate it further. I'm assuming this is why the G4 computer name is blank.
I've since trashed the System Configuration folder again, so I'm back to where I started with the firewall denying connection attempts to iTunes even though it is set to allow. I've tried to follow my previous steps (giving the computer a name in System Preferences/Sharing) to get it to work but haven't had any luck.
Is there a way to force the system to assign a name to my computer?  Or any other insights into what may be the problem would be much appreciated!

I was having the same problem.  Simple solution that worked for me:
1. Under Security/Firewall, remove iTunes access allowance (-).
2. Set it to allow all incoming connections.
3. Restart computer.
4. Open Settings/Security/Firewall
5. Set access for specific services and applications.
6. Add ( + ) iTunes access and allow incoming connections.
For me, it seemed the firewall was just getting stuck.  Don't know how it will hold up long term.
Good luck.

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