Hi, Currently running Vista Post RC1 build 5728 (32bit). I found the existing firewall built into vista is very good. It passes all the tests at GRC.com as well as pcflank.com. But since the outbound connection are not controlled, I wanted a port monitor / blocker at least if there is no firewall. I just was frustrated at the lack of 3rd party firewalls in Vista. I tried almost all the port monitors available. All failed either to install or to run except AppDefend. The present trial download works well except that it complains unified driver loading problem if started from HKLM\Run. If I disable this from registry as well as from settings option in Appdefend and start manually it works perfectly. Regdefend also works fine but I have disabled it for now.