Dashboard – WordPress Blog stopped working

For a few days now the WordPress news feed (https://www.ads-software.com/news/feed/) in the dashboard has stopped working for me. I have my own web server and several WordPress blogs and the same is true for all of them, including a brand new one I just started setting up. The error message I get is “RSS Error: WP HTTP Error: name lookup timed out”.

However, the other feed in the dashboard (https://planet.www.ads-software.com/feed/) is working fine.

Is anyone else having problems with one and not the other?