No connection to the html

I’ve just started to code my first program in R in (Introduction to R), the ‘CodeAcademy’ has connected but the server doesn’t connect. I mean the HTML website does not connect. Here is what it says:
"
Hmm. We’re having trouble finding that site.

We can’t connect to the server at 7fdf2c515bdd4b5da153dee3d3572e1a.cc-propeller.cloud.

If that address is correct, here are three other things you can try:

Try again later.
Check your network connection.
If you are connected but behind a firewall, check that Firefox has permission to access the Web.

"

Hi there, welcome to the forums.

It could have been an intermittent issue with your connection; are you still having this problem?