What is it and what does it do?

[JonatanRaven]

And most importantly, why is it blocking sites for me?

Here's the problem, I haven't (knowingly) installed anything called ISPConfig, I'm running Mozilla Firefox 2.0.0.4 [Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.8.1.4) Gecko/20070515 Firefox/2.0.0.4]. I run a forum at http://huggkubbarna.forumportal.se/ and all I get when I'm trying to access my forum is what's on the following screendumps:

http://www.filecabin.com/photos/view.php?mode=gallery&g=1253

http://www.filecabin.com/photos/files/t/b84/9262290607Skärmdump1.jpg (http://www.filecabin.com/photos/view.php?mode=gallery&g=1253&photo=1) http://www.filecabin.com/photos/files/t/b84/8240290607Skärmdump2.jpg (http://www.filecabin.com/photos/view.php?mode=gallery&g=1253&photo=2)

[till]

If this is not your own server, it might be that your hosting provider uses ISPConfig to manage the server. So if you have any problems with your website, contact your webspace hosting provider.