Players on Craftyn were relieved Thursday afternoon when Minecraft's process servers were restored after being down for over 8 hours allowing them back onto Craftyn. Earlier Thursday morning Multiplayer Session and Authentication servers went down. There is so far no explanation for the problems.
The entire day was strife with problems for Mojang's servers, according to the official Mojang Status Twitter feed:
We are aware off and working on the server issues. Sorry about the problems.
— Mojang Status (@MojangStatus) July 22, 2015
We’re still having issues with the session/auth servers & are working to resolve them. If you can’t get on a server, please try a few times.
— Mojang Status (@MojangStatus) July 23, 2015
06:44 UTC ✔ Multiplayer Sessions are back online, they were down for 517 minutes
http://t.co/TNwvQ36E2F #mcstatus
— Minecraft Status (@StatusMinecraft) July 23, 2015