I'm guessing ZoneAlarm is an anti virus protection? It might be a firewall... I don't know, I've never used it. But anyway, in most programs like those, and I'm assuming they're the same, there is an "allow" list of things and an "un-allow" just set Blockland to the allow part and it should work.
If it doesn't then ZoneAlarm isn't like other programs... and thats odd.