Blizzard has announced that the 10.1 PTR realms are offline for maintenance unrelated to a new Weekly build.
Greetings!Our 10.1 PTR Realms will be going offline at 2pm PDT (5pm EDT) for some server hardware maintenance (unrelated to a new weekly build, although we’re working on that too).This will be an extended maintenance and may go into tomorrow; either way we expect the PTR Realms to be back online by tomorrow afternoon at the latest.Thanks!. Read more on wowhead.com