On one laptop in our school we're having an issue where various (seemingly random) websites redirect to Apache or IIS test pages (or what I guess is the webserver's default IP)... I've seen this before where the machine isn't configured to use our/our LEA's proxy servers but I've checked this already and IE is certainly going through our Forefront box (which upstreams to an E2BN proxy).

I've checked the hosts file, DNS is set to our primary and secondary DCs as it should and the proxy setting is correct, the correct IPs are returned when I ping any of the sites in question and it's not happening on any other machine in the school.

Has anyone else come across this before?