"Error establishing a database connection" error

So, I went to my site and came into an “Error establishing a database connection” error.

It started with this page…


…now it’s at this page…


Any help with this issue will be appreciated.

Looks like the site is running now. What was the fix?

In the second screenshot, it appears to be an URL-doubling typo (vanndigital.comwww.vanndigital.com), so DNS lookup fails.