Hi,
I had the same problem since octobre 21st with pages like sites of xs4all, Clanbase and some more.
Today I could access the sites i mentioned by using one of the chello proxy servers (in my case the proxy.brabant.chello.nl). Still a miracle to me why i need a proxy in order to view these sites.
Other people I know were able to browse to those sites when i tried at the same time. nslookup to those sites does work.
Would like to know why all of a sudden this problem arose, so far noone could give me an explanation.
fyi: my setup is simple: PC - Firewall - Chello.
Nothing changed in my setup last year, also firewall configuration has not been altered lately and my PC is clean of any form of d/l or p2p programs or any other programs that could interfere with network connections besides a browser, irc and games. Only thing changed on the PC is the most recent XP Update a had lately (must check date of update).