Forced Close?

[Jojua]

Whenever i try to connect to the mcsg servers as well as the server hub, i get this message after a few seconds:
Internal Exception: java.io.IOException: An existing connection was forcibly closed by the remote host.
I only started getting this message today, while using 1.7.2. When i try to use 1.6 my computer just gets stuck and crashes minecraft.
Can anyone halp?

Edit: i only get this problem on the mcsg servers.

 

[MetagrossVSwablu]

To quote Chad, "NOTICE: You can NOT log in with 1.6.2/1.6.4 right now, as Mojang's legacy session servers are down. Until they fix it, you can only log in with 1.7.2. For information, check their official support site.
http://www.minecraftsurvivalgames.c...updated-to-support-1-6-and-1-7-clients.67375/
QA;TL
Reopened by popular demand