scanning over the network and firewall configuration

Hi all,

I am trying to configure my firewall to allow scanning (as a client) 
over the network.
With guarddog, I have enabled the tcp port 6566.
If the firewall is off, scannig is OK.
If the firewall is on, connection withe the scanner works, I can launch 
the preview but it seems that no data is send back and xsane freezes.
If the firewall is configured with firestarter, enabling the  port 6566 
is enough.
As I prefer guarddog, I would like to know how to configure correctly 
guarddog.

TIA,

Alain


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