Allowing Access from a Networked Computer

I have two laptops on a wireless network. I can access Computer 1 from Computer 2, but not visa versa, UNLESS I disable Comodo Internet Security firewall on Computer 2. Computer 2 has Comodo Internet Security installed; but the other does not. How can I modify the CIS settings on Computer 2 to allow access from Computer 1?

Thanks…nlavery