I attempted to run updates from the
Application Installer and ran into the following error.
failed to download https://extensions.ognome.org//extension-query/?shell_version=3.22.3&page=1&n_per_page=1000: Cannot resolve hostname
I successfully ran
# yum update prior to that and a second time yielded no updates. I also opened up a browser and had no problems browsing to a site.
If I read the problem correctly, CentOS cannot find extensions.gnome.org.
Here is a screenshot.