Can't Get MacBook Pro and Mac Pro to Network

I have a MacBook Pro (2008 - 2.5 Ghz. Core 2 Duo with 4 Gb of RAM running OS X 10.6.7) that I have been connecting to my Mac Pro (2005 - 2 2.66 Ghz Xeon with 20 Gb of RAM running OS X 10.6.7) through an Ethernet switch on my school's network. This has worked without a hitch for years, but when I upgraded to 10.6.7 recently, the MacBook and Mac Pro fail to network. On the MacBook Pro, the Mac Pro's icon doesn't show in the shared area, and on the Mac Pro, I can see the icon for the MacBook Pro, but when I click on the icon to connect, I get the message that "Connection Failed There was an error connecting to the server (name of my MacBook Pro). Check the server name or IP address, and then try again." I have tried a direct connect using the "Connect to Server" under the Go menu on both machines, using their IP addresses, but no luck. Is there something I need to re-set to get these two to talk again? I have other Macs on the same network that my MacBook and my Mac Pro can see, and both machines can connect to them. They just can't connect to each other.
Thanks in advance for any ideas you might have on how to fix this.

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