403 - Forbidden Error for RHEL Repos with the Clients registered to smart proxy

It worked for me but I also had to update the CA cert in the pulpcore database.

su - postgres
psql -d pulpcore
\set content `cat /etc/pki/katello/certs/katello-default-ca-stripped.crt`
update certguard_rhsmcertguard SET ca_certificate = :‘content’ ;