samzenpus from the try-it-like-this dept.
An anonymous reader writes "Windows 8 has been confirmed to not only ignore, but also modify the hosts file. As soon as a website that should be blocked is accessed, the corresponding entry in the hosts file is removed, even if the hosts file is read-only. The hosts file is a popular, cross-platform way of blocking access to certain domains, such as ad-serving websites."
We warn the reader in advance that the proof presented here depends on a
clever but highly unmotivated trick.
-- Howard Anton, "Elementary Linear Algebra"