@Sebahat.hadzhi Thanks for your feedback. The problem is that changing the ruleset is no option because of possible side effects (restrictive ruleset).
I have the same issue: In "Index of /10.5/centos7-amd64/rpms/" foe example the requested file "MariaDB-client-10.5.14-1.el7.centos.x86_64.rpm" is not available. What should I do now?
Also "yum update" failes with this error:
MariaDB-client-10.5.14-1.el7.c FAILED...