I am unable to access this website with Firefox http://www.confickerworkinggroup.org/infection_test/cfeyechart.html However, if I tick Firefox in the excluded applications list of Protocol Filtering, the website comes up a treat. I also have PRTG now set to monitor the same website, and it gets blocked unless I tick PRTG in the excluded applications list. Interestingly, if you untick these applications in the list, they continue to work .. until a restart? until something else? or time? Hmmm. What is very frustrating here is that there does not seem to be any logging of the protocol filtering. Or is there? Operating system is XP Pro SP3 - NOD32 Antivirus version 4.