How do I change the HA Redirect?

How do I change the HA Redirect?

When entering the domain to the HA server, it redirects to the primary server. This is be design but it is redirecting to the FQDN of the primary server and not the primary server URL which we have the SSL issued to. Where / how do I change it to redirect to the URL and not the FQDN of the primary server? 

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