I’ve got this problem as well even after yum --enablerepo=* clean all
Specifically in my case I get
Trying other mirror.
nethserver-cockpit-0.2.0-1.ns7 FAILED
http://ns-mirror3.ibi.net.br/7.6.1810/updates/x86_64/Packages/nethserver-cockpit-0.2.0-1.ns7.noarch.rpm: [Errno 14] HTTP Error 416 - Requested Range Not Satisfiable
Trying other mirror.
Error downloading packages:
nethserver-cockpit-0.2.0-1.ns7.noarch: [Errno 256] No more mirrors to try.