https://cdn.redhat.com/content/beta/rhel/server/7/x86_64/rt/os/repodata/repomd.xml: [Errno 14] HTTPS Error 403 - Forbidden

[hawksbill]

Running a yum install give this error, with a problem repository.

https://cdn.redhat.com/content/beta/rhel/server/7/x86_64/rt/os/repodata/repomd.xml: [Errno 14] HTTPS Error 403 - Forbidden
Trying other mirror.

Change repo for you repo name.
Disable the problem repository and run your install command again.

$ sudo yum-config-manager --disable rhel-7-server-rt-beta-rpms

or if you want to temporarily display the repo while running you yum install do this:

$ yum --disablerepo=rhel-7-server-rt-beta-rpms install samba