Can no longer connect my MBP to a local file server

I can no longer connect to a particular computer on my local network from my MBP(Mid 2010 running 10.6.6). I am trying to connect to a Mac G4 tower running 10.4.11. This has worked in the past but now does not.
An older MBP(Mid 2007 running 10.6.6) has no problem connecting to the G4. My Mid 2010 MBP can connect to the older MBP. The Mid 2010 MBP can also connect via smb to a PC on my local network. All of my systems can connect as clients to the Mid 2010 MBP.
The G4 does show up in the Mid 2010 Finder window sidebar under Shared. I can ping the G4 from the Mid 2010. I can even ssh into the G4 using the CLI from the Mid 2010. When I try to connect to the G4, either via the Shared Icon in the sidebar or via Cmd-K, I instantly get a "Connection failed" message. I have, via afp, tried both the server name and the IP, both of which work fine on the older MBP. No effect. I ran full Applejack on my Mid 2010. No effect. I reapplied the 10.6.6 Combo Updater. No effect. I deleted all references to the G4 in my keychain, but the "Connection failed"  message comes before any attempt at authentication. Grasping that straw had no effect. I do have Snow Leopard Cache Cleaner but hesitate to nuke all my caches before trying something else. Ideas anyone? Thanks.

I forgot to add: I also tried a different user account on the Mid 2010 MBP to connect to the G4. No effect.

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