I have Zonealarm and it works fine with catalog being given access to the network only. i.e. it has no need to act as a server.
the only thing I can think of is that it's an earlier version of catalog that you've given access rights to and that the current version has no access rights.
Try making sure that 'automatic lock' is set to 'off' and then try to start up actinic and do an update. Zonealarm should ask whether you want a program to have access before blocking it.
Thanks. Tried that - not for the first time - and it hangs now when it gets to the first base file upload. Maybe I need a new version of Zonealarm. I think it started doing this when I upgraded to XP.
Comment