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