I tried a number of different urls (no IP addresses), and all of them were failing with that error (seems to me like there may have been some sort of networking issue with the underlying machine).
The specific link I was hoping to test is http://tfr.link/l/6-ZJtzk04o.
However, since posting this, the service seems to have come back up, and now successfully scrapes that and any other link I provide it with.