Unable to register new server in DMZ.

I received a request to build a new external SFTP server for part of my company. We have a new DMZ area we wanted to deploy (network reconfig going on) so the server is the 1st in this area. To save time, I built the server (vmware vm) internally and registered with our Satellite server. Now that is in the DMZ it, of course, can not see the internal Satellite server.

So, I was attempting to point this server to Red Hat for the subscription management and yum repository access.

I modified the
/etc/rhsm/rhsm.conf
and change the hostname to
subscription.rhsm.redhat.com
and the Content Base URL to
https://cdn.redhat.com

When I run the subscription-manager register this is the error I get.

Unregistering from: subscription.rhsm.redhat.com:443/rhsm
Remote server error. Please check the connection details, or see /var/log/rhsm/rhsm.log for more information.

/var/log/rhsm/rhsm.log isn't being helpful really.

I have not tried this before and I may be going about it entirely wrong.