RedHat Subscription

If a system is already registered and causing problems;

sudo systemctl stop rhsmcertd

sudo rm -rf /etc/pki/consumer/*

sudo rm -rf /etc/pki/entitlement/*

sudo rm -rf /var/lib/rhsm/cache/*

sudo rm -rf /var/lib/rhsm/facts/*

sudo rm -rf /etc/rhsm-host

sudo subscription-manager clean

then

sudo systemctl start rhsmcertd

and to verify that the old registration is gone;

sudo subscription-manager identity

then register again;

sudo subscription-manager register

and attach;

sudo subscription-manager attach --auto