Trouble w/VNC and Bonjour

Having trouble using vnc on my home (AExpress) network. I've tried chicken of the vnc and vine viewer, but both give me the same problem. I have two macs running 10.4, and I set up one of them as a vnc server using ARD, but when I try to connect to it from the other one, it can't connect. Chicken of the vnc says "can't connect:()", and Vine viewer just spins for a while and then reports a timeout.
AGain, this is from one machine into the other inside my home network. I'm not trying to access anything from the internet. Both machines have internet access via airport cards through the AE, they both show up in each other's networks, etc.
What's strange to me is that when I try to open a connection, the target computer does show up via Bonjour. So why doesn't the connection occur? The vnc client seems to 'know' it's there, right??
From doing some so-far fruitless research on this it looks like assigning static ip addresses is something I'll have to (reluctantly) try. Reluctantly because I fear I'll mess up their internet connections or something. Any ideas on why I can't connect?

Bump.

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