Can't screen share on one computer on LAN; strange vnc settings?

While troubleshooting problems using FaceTime on Mac on one of four computers on my LAN, I discovered several strange things about the Mac in question.
Though the Mac's name shows up on all the other computers on the LAN under the "Shared" area of the finder window, none of the computers can connect for file sharing or screen sharing even though these are turned on in the system prefs.
Even seemingly stranger, it is impossible to connect to this computer using VNC. Under the Screen Sharing section of "Sharing" it states, "Other users can access your computer at vnc://thebmac.comcast.net/ or browse for "beckyiMac"'. The odd thing here is the vnc address. It seems to be using an old name for the computer. The current name of the computer is "beckyiMac".
On other computers on my LAN some are listed with their local ip numeric address in the vnc address and others are listed with terms such as "homemacproethernet.comcast.net".
I guess one of my questions is how does the computer assign the vnc address seen on the Screen Sharing set up page? Is there a way to change this?
Thanks.
John

Have you tried Bonjour for screen sharing on your local network?
It works without problems on my local network, these are the settings that work for me:
Enable Bonjour messaging in iChat preferences>select use Bonjour instant messaging.
With iChat open select "enable screen sharing" from the top menu>video
In order to get it to work on my local network I had to disable screen sharing in Apple menu>System preferences>sharing.
The firewall settings are set to specifically allow the iChat application.
These settings should be set on all Mac's on your local network you wish to use iChat screen sharing with.
It might not work with a mac that has the file vault feature enabled.
My router settings are in default.

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