The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.
Registering an Oracle Linux guest that is running under Virtual Box
with ULN might fail with a server communication error. The
workaround is to run the following command as the
root user on the guest:
# echo "uuid=`uuidgen -t`" >> /etc/sysconfig/rhn/up2date
You can then re-run the uln_register command. (Bug ID 14696776)