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