It can be the connection between you and the Blockland server
If you are on windows, you can try to ping it by typing "CMD" in your searchbar when clicking start.
It should open a black command window.
There type in the command:
ping blockland.us
Type it a couple of times. It should respond 4 times every command.
If it gives some Timeouts, there is a slight communication error. Which can resolve after a couple of hours
If they are all timeouts, there is no connection what so ever.
This could indicate a problem with your ISP, or a highly defended firewall somewhere along the connection or with you.
Either way you can't do anything about it, but you would have some more information.