comodo firewall & ditto clipboard

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i have just put the firewall comodo pro on my systems(freeware) i came across a problem.

ditto clipboard allows to send info/files between computers. one computer can send text to the other. but when i try it onto the other computer, it tells me it can not open connection. looking at the setting under application, on the system that can send. it has two enteries in/out. on the system that can not send. it just has the entery in. putting in the out entry, it still gives me the error of can not open connection.

any ideas on how to fix this problem.

address for programs. ditto