Please make sure to have following or later version of the packages installed on the system before October 9, 2018.
Oracle Linux 7
rhn-client-tools-2.0.2-21.0.9.el7.noarch.rpm
rhn-setup-2.0.2-21.0.9.el7.noarch.rpm
rhn-check-2.0.2-21.0.9.el7.noarch.rpm
rhn-setup-gnome-2.0.2-21.0.9.el7.noarch.rpm (if the older version of this package is installed)
Oracle Linux 6
rhn-setup-1.0.0.1-45.0.3.el6.noarch.rpm
rhn-client-tools-1.0.0.1-45.0.3.el6.noarch.rpm
rhn-check-1.0.0.1-45.0.3.el6.noarch.rpm
rhn-setup-gnome-1.0.0.1-45.0.3.el6.noarch.rpm (if the older version of this package is installed)
Oracle Linux 5
x86_64:
up2date-5.10.1-41.30.el5.x86_64.rpm
up2date-gnome-5.10.1-41.30.el5.x86_64.rpm (if the older version of this package is installed)
i386:
up2date-5.10.1-41.30.el5.i386.rpm
up2date-gnome-5.10.1-41.30.el5.i386.rpm (if the older version of this package is installed)
ia64:
up2date-5.10.1-41.30.el5.ia64.rpm
up2date-gnome-5.10.1-41.30.el5.ia64.rpm (if the older version of this package is installed)
After October 9, 2018, you have to run the following steps to update the client SSL certificate on your Oracle Linux machine: