Enabling DNS proxy feature on Red Hat Satellite 6.6 is failing

Issue

• Enabling DNS proxy feature on Red Hat Satellite 6.6 is failing with the following errors -

[ERROR 2019-11-25T15:53:33 main] Errors encountered during run:
[ERROR 2019-11-25T15:53:33 main]  Proxy satellite.example.com has failed to load one or more features (DNS), check /var/log/foreman-proxy/proxy.log for configuration errors
[ERROR 2019-11-25T15:53:33 main] /usr/share/foreman-installer/modules/foreman/lib/puppet/provider/foreman_smartproxy/rest_v3.rb:70:in `validate_features!'
[ERROR 2019-11-25T15:53:33 main] /usr/share/foreman-installer/modules/foreman/lib/puppet/provider/foreman_smartproxy/rest_v3.rb:59:in `refresh_features!'
.....

[ERROR 2019-11-25T15:53:33 main]  /Stage[main]/Foreman_proxy::Register/Foreman_smartproxy[satellite.example.com]/features: change from ["Ansible", "Discovery", "Dynflow", "HTTPBoot", "Logs", "Openscap", "Pulp", "Puppet", "Puppet CA", "SSH", "TFTP", "Templates"] to ["Ansible", "DNS", "Discovery", "Dynflow", "HTTPBoot", "Logs", "Openscap", "Puppet", "Puppet CA", "TFTP", "Templates"] failed: Proxy satellite.example.com has failed to load one or more features (DNS), check /var/log/foreman-proxy/proxy.log for configuration errors
[DEBUG 2019-11-25T15:53:33 main] Cleaning /tmp/kafo_puppet20191125-17450-kdmi0l.conf
[DEBUG 2019-11-25T15:53:33 main] Cleaning /tmp/kafo_hiera20191125-17450-s4v93c
.....