Yes, the server was down a few times today, around 12 CET, and again around 17 CET. They and SAKWiki are all on the same server. There is a multitool.org group on facebook where you can get updates if something like this happens. https://www.facebook.com/groups/15283224015/
Im not sure but next time you can use this website to check if its just you or everyone having the issue. http://www.downforeveryoneorjustme.com/