I posted this question at the Avira forum this afternoon. Since no one has answered yet, I thought maybe someone here might know. Here's the question......... Why is it when I run the Shields Up test at grc.com when running Avira Security Suite, I fail the the test? All ports are stealth except for one. Port 0, Service <nil>, Statis-Closed. Every other firewall I've tested using Shields Up, all ports, including Port 0, are stealth. Why can't Avira's firewall stealth that port? Anyone know why this would happen?