Screen sharing worked and not working

i have set up both my computers for screen sharing and have accessed my macbook pro 17" (snow leopard- up to date) for months on my macbook pro 15" (lion- up to date)- it worked....
THEN, when i went in reverse- mb17" accessing my mb15"- it worked...
BUT NOW... neither can access eachother's screen remotely! haven't changed anything, but get the message that i need to 'check the screen sharing is enabled, that my network is working', OR i get the endless 'connecting to mb17"' window that never connects- on both computers!
HOWEVER- both computers can access files remotely... just not the screen
what to do? like i said, IT WORKED until my mp17" accessed my mb15" and neither works... like it cancelled eachother out!
any help would be greatly appreciated!

Hi,
Since the earlier post I have managed to Screen Share.
I did put the Mac Firewall On.
It was then as simple as using the item in the iChat Buddies menu (The option to allow sharing has to be On in the Video menu)
It replaced the Video I was having and does not go back to the Video when the Keystroke of Control+ESC is used and the Video chat has to be re-established.
I do not have Encryption.
9:04 PM Tuesday; November 13, 2007

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Hi,
Since the earlier post I have managed to Screen Share.
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9:04 PM Tuesday; November 13, 2007

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