We check this website, now git-scm.com is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is git-scm Down Right Now? - NO! git-scm is up!
If you have problem with access to site git-scm, and domain git-scm.com is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).