When joining a server: "Logging in..." forever

When trying to log into any Minecraft 13w41b, Minecraft tells me that it is logging in, and well, never stops. I'd LOVE to join a snapshot server, so, lets fix this!

EDIT: After trying again, this time I got this error: "Internal Exception: io.netty.handler.timeout.ReadTiomeoutException"

This makes me think it's a problem with my internet, but I can connect to 1.6.4 servers just fine... help?