I uninstalled Sunbelt Kerio and installed LooknStop. Everything looked fine, the ShieldsUp test showed all ports on 'stealth'. Checking the Security Centre I found out, to my surprise, that the Windows Firewall had been activated. I deactivated this firewall, did a second test on ShieldsUp and this time I didn't pass the test: a port somewhere between 70 and 90 and a whole row in the thousand were only 'closed'. I uninstalled LooknStop, installed it again, same problem. Put back an Acronis-image with Kerio, for the time being. Anybody knows what is the problem and what to do about it?