Diablo 2 Mac Download Not Working 10.6

I've tried adding Diablo 2 to the list of applications to allow incoming connections but it still doesn't work. When I switch off the Firewall it does work. I have Diablo 2 running on a MBP 10.6.4 and an iMac running 10.5.x. If I host a game over local TCP/IP on the MBP it only works if the firewall is switched off.
Snow Leopard doesn't allow ports to be opened, so if adding Diablo 2 to the Firewall application list doesn't help there is nothing more I can do, other than leave the Firewall off?
I assume it has nothing to do with the router, as it's getting through when the MBP Firewall is off. (iMac firewall remains on).

Diablo II: LoD Updater X 1.13d - Diablo II expansion update. Download the latest versions of the best Mac apps at safe and trusted MacUpdate. It will work with Intel Macs running up to Mac OS X 10.6.8 under Rosetta. It will not work with OS X 10.7 Lion What's New in Diablo II: LoD Updater X.

Mac Pro 2.8Ghz 8-core / MBP Unibody 2.4Ghz, Mac OS X (10.6.4), 8GB RAM, GeForce 8800GT / 4GB RAM

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Diablo 2 Installer Not Working

Diablo 2 Mac Download Not Working 10.6

Diablo 2 Mac Download Not Working 10.6 Download

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