I am not sure of the free version anymore but I can d/load it and see, however there are quite a few versions of zonealarm about now I wonder which one you have. Just a thought though if you have the free version which is a trial I believe then it only lasts 15 days, what is the point in unblocking it for 15 days?
Ultraviolent
P.S I have not actually used zonealarm for a number of years due to running linux so any help or info appreciated.