I mentioned some time ago that I set up an obsolete laptop as a router/firewall using IPFire... Well, part of the setup is a transparent proxy, which I use to filter ads. And lately, it's been blocking entire pages that shouldn't qualify as ads. For instance: Note how the URL in the browser toolbar is different from the one supposedly being blocked... I would have figured this was a quirk of the filtering proxy, erroneously blocking a whole page due to embedded ad content. But I've also noticed that this sometimes happens when I go to sites with no ad content - this forum for instance. Sometimes I enter a definitely ad-free URL into the toolbar, hit return, and am greeted with the Access Denied page; and the page I wanted only becomes accessible if I hit the refresh button. This happens on all my computers, bar none; and apparently with all browsers. It happens more often with some browsers than with others (e.g. much more with IE than with Firefox) but if I browse, I eventually encounter it. The router logs and settings don't look abnormal; but then, if it were hacked, they probably woudn't. So what does this sound like? A bug in the filtering proxy? Or something more nefarious?