Can't Connect MacBook Pro and Mac Pro

I have a MacBook Pro (pre 2008 - dual core) running OS X 10.6.7 and I regularly connect it to the Mac Pro at my work (also running OS X 10.6.7). I've had no problems until recently. Now, when I try to connect, I get the following message:
"The server "name of my MacBook Pro" may not exist or it is unavailable at this time. Check the server name or IP address, check your network connection, and then try again."
Sometimes I click the icon to connect, the computer tries for a minute or so to connect, then it disappears from the shared list.
This happens whether I try to connect from either computer to the other one.
Ideas? Suggestions?
This is frustrating.

I'm still having problems with connecting my MacBook Pro with my Mac Pro. Both are running Snow Leopard (10.6.7). I have tried repairing permissions and toggling settings in my Sharing, but no luck. I'm still getting "The server "name of my MacBook Pro" may not exist or it is unavailable at this time. Check the server name or IP address, check your network connection, and then try again."
Anyone have any other suggestions?

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