I am trying to add, edit delete ports and sometimes stop temporarily the firewall and it suddenly quits. Very buggy, For example if I click the stop button it quits, if I want to allow or deny any port it quits saying "There was an unexpected error setting up the firewall DoorStop X cannot operate."(5364)I does quit but it changes the configuration which I don't know if it's working or not. I like the fact that you can assign custom icons to the different port configurations, the interface is very simple but again this unexpected quits are really not acceptable for the price.