Problems by connecting to most Minecraft servers

Connection Lost
Failed to Login: java.io.FileNotFoundException: http://session.minecraft.net/game/joinserver.jsp?user=<My name>&sessionId=<ID>
I get this report when I try to log in the most Minecraft servers. I have the newest Java and the newest Minecraft version. The bug occured in Minecraft 1.4.4 too.

I wanna know why old issue has no effect. It was created 20/Nov/12 2:04 PM. I have still the same problems!