the link scratch.mit.edu isn't loading. It has opened before but recently no success. "The server at search.mit.edu is taking too long to respond"
Given that you did connect successfully earlier, you might have tried to log in during scheduled downtime.
You may have also been reported, and subsequently banned for a few days at a time (or longer, if your infraction was severe), or maybe your internet is down.
Other than that, is there anything that could be preventing you from connecting, such as a firewall?
Here is a link to the website, which you can try: http://scratch.mit.edu