The took them offline after a security breach, and they never came back. https://www.engadget.com/2019-09-03-xkcd-forum-breach-exposes-details-from-over-560-000

The took them offline after a security breach, and they never came back. https://www.engadget.com/2019-09-03-xkcd-forum-breach-exposes-details-from-over-560-000-user-account.html https://www.engadget.com/2019-09-03-xkcd-forum-breach-expose...