Screen Sharing/File works on one computer but not the other???

Two computers, both running the exact same version of Snow Leopard.
One is a Unibody MacBook Pro 2.66, the other 27" iMac i7. The MacBook Pro can't connect to the iMac, but I can get the iMac to connect to the MacBook Pro to pull files and screen share (pull files from MacBook, while on iMac).
My settings seem to be exactly the same. I've gone over them again and again (in sharing) is there something I might be overlooking?
Is there a firewall that might be enabled on one? Something else?

HI,
The MacBook Pro can't connect to the iMac
Just checking... open System Preferences / Sharing. Make sure File Sharing and Screen Sharing are selected.
You may have to click the gold padlock icon bottom left corner of that pane to make changes. You will be prompted for your admin password.
Firewall on or off shouldn't make a difference.
Carolyn

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