No precipitation when using Zone Alarm

Hello Captains,

Do any of my fellow Active Sky users also use ZA free or Pro, if so how is it configured for AS? Recently, after an update, it began interfering with ASP3Dv4.5; specifically it never rains in southern California.....nor anywhere else for that matter! AS is properly installed with admin rights and full permissions in ZA. AS communicates with HiFi's servers and downloads weather updates as normal but ZA is somehow obstructing this data from getting through to P3D. I noticed this abnormality recently when we had a heavy downpour one day, yet none at my local airports within the sim. Not a spot of rain, until I shut down ZA, then...viola...rain, glorious rain! 

From the manual "In order for proper radar data communication to take place between ASConnect (server) and ASP4 (client), you must open the Radar data network port (TCP) on both machines for incoming packets.  By default this port is 19284"

I suspect that this is the problem, can anyone tell me how to open this port in ZA? I'm using a single Pc btw, any help appreciated, thanks