[CentOS] invalid base url

Thu Dec 6 19:54:50 UTC 2018
Jerry Geis <jerry.geis at gmail.com>

I have a number of updates to C7.6
but now I am getting

Cannot find a valid baseurl for repo base/7/x86_64

Did something happen? What do I do ?
This machine has internet access and appears to resolve other sites. I get
a list when trying to access mirrorlist...