Configuring a machine to be an ipa replica

I've been following the Linux Domain Identity Authentication and Policy guide (https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/linux_domain_identity_authentication_and_policy_guide/index) in trying to create a replica of an ipa server we have but the process fails. I think it's because the process needs certificates in place on the replica but the guide mentions nothing about this.

The command I use is:
ipa-replica-install –principal admin –admin-password ****** –server ****** --domain ******* –setup-ca

Is there a comprehensive guide on how to configure a machine to be an IdM replica (RHEL 7)?

****EDIT****
The actual error I get is "LDAP server is not responding, unable to verify if this is an ipa server"

Some advice ... any advice would be gratefully received.