Hi, i am using some software to automatically set the clock in certain intervalls. Also i´m using Comodo´s CPF3. Some check on GRC showed, that ports 13, 37 & 123 are permanently open. Is this a potentiall security risc? I guess they have to be open in order to function properly. Or can the firewall be configured to keep this ports "stealth", despite of being "listening"? Thanks for your suggestions!