These errors typically mean that there is an increase in traffic to the site, and the servers and/or ISP can't handle the traffic load. Think of it like a bunch of people trying to get through the doorways of a concert hall to see their favourite band play. The lineups get long.

Just hit F5 on your keyboard to refresh your connection (maybe a couple of times or three times if the error repeats itself). This refreshes your browser, and attempts to connect your way through the doors again.

Failing that... traffic should subside over time.

Hayz