Internet Sharing not working in 10.5.8

I'm running a Mac mini (PowerPC) with Leopard.
My situation is a little different from most. My Mac mini is connected to my network via AirPort. I use it in my home office, which is located some distance from where my Internet connection comes into the house.
I have a Nortel IP phone for working remotely from my main office. In the past, i have successfully used it with my Mac mini via Internet sharing. By turning on Internet sharing and connecting the IP phone to the Mac mini via Ethernet, it finds its server and connects without issue. I do get occasional dropouts due to the wireless bandwidth, but nothing too severe.
A few weeks ago, i updated the Mac mini to Leopard, and applied all the updates to bring it up to the most recent version available, 10.5.8. My Internet sharing no longer works.
I have tried reinstalling the 10.5.8 combo updater. I have tried the workarounds where a kext from 10.5.7 is swapped out for the more recent one. I've tried rebooting. I've tried manually setting the DHCP address on the Ethernet connection. Nothing works.
Apple, please issue a fix for this issue. My only other option at this point seems to be an archive-and-install of Leopard, then applying the 10.5.7 Combo Updater and freezing my machine there.
Are there any other fixes or workarounds that can get Internet Sharing working again? It works fine on my Snow Leopard machine.
This bug is a huge pain in the butt.

I'm having this problem but it was after I installed security update 2010-003, that put my at OS X 10.6.3.
My internet sharing isn't working but moreover, my Ethernet port isn't working at all. I can't find anything on this issue. I just updated this morning and I usually use the internet sharing to share the airport connection through the Ethernet port and have never experienced a problem until now. Now matter what I do, after restart, putting it in sleep and everything I can think of, it still says Ethernet cable is unplugged.
did you ever find a fix?

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