Can't Access Documentation, 'Secure Connection Failed'

Since around midday yesterday I’ve been unable to access the documentation at all. All I did was turn my PC back on, and find out I can’t load the docs. I’ve tried it from several different browsers and computers, but to no avail.
Firefox gives me this message:

Secure Connection Failed
The connection to the server was reset while the page was loading.

  • The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
  • Please contact the website owners to inform them of this problem.

And Chrome gives me this:

This webpage is not available.
The connection to was interrupted.

No other websites that I’ve visited seem to have this problem. However, I haven’t found any other accounts of this problem, so I’m wondering if it’s not somehow an issue with my network.

And now suddenly the website is working again. I didn’t do anything, and I don’t know what happened, but after refreshing the page every now and then, it suddenly works.