We check this website, now yu0123456.com is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is yu0123456 Down Right Now? - NO! yu0123456 is up!
If you have problem with access to site yu0123456, and domain yu0123456.com is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).