It is currently 2:04 P.M. Eastern Standard Time on September 21, 2013. Minecraft.net login servers are down. Here is the error:

Error loading: https://mojang.com/feed/: Server returned HTTP response code: 503 for URL: https://mojang.com/feed/
java.io.IOException: Server returned HTTP response code: 503 for URL: https://login.minecraft.net/

• It is currently 2:09 P.M. EST and the login servers are still down.
• It is currently 2:15 P.M. EST and the login servers are still down.
• It is currently 2:20 P.M. EST and the login servers are still down.
• It is currently 2:35 P.M. EST and the login servers are still down.
• It is currently 2:45 P.M. EST and the login servers are still down.
• It is currently 3:05 P.M. EST and the login servers are still down.
• It is currently 3:20 P.M. EST and the login servers are still down.
• It is currently 3:35 P.M. EST and the login servers are still down.
• It is currently 3:50 P.M. EST and the login servers are still down.
• It is currently 4:00 P.M. EST and the login servers are still down.

The servers are now back up.