Web186, Web334, and Web220 are experiencing a distributed denial-of-service attack, which is currently preventing access to all sites hosted there. We are working to mitigate the effects of the attack and will update this post with our progress.
2012-08-01 05:24 UTC: Service has been restored to Web220 and Web334. If you’re not able to access either of those servers, please open a support ticket so that we can help you get back on. Work on Web186 is still in progress.
2012-08-02 7:30:26 UTC: Service has been restored on Web186 too.