We had a VMware Technical engineer look at the issue and found out that we had manually add the IP addresses, FQDN and Short name in the Host File ( of Production and Target Replication appliances) like so:
# Begin /etc/hosts (network card version)
# End /etc/hosts (network card version)
# VAMI_EDIT_BEGIN
# Generated by Studio VAMI service. Do not modify manually.
127.0.0.1 Prod-vR localhost
192.168.0.58 Dr-vcenter.lp.com.au Dr-vcenter
192.168.0.48 Dr-vr.lp.com.au Dr-vr
192.168.0.59 Prod-vcenter.lp.com.au Prod-vcenter
::1 Prod-vR localhost ipv6-localhost ipv6-loopback
# VAMI_EDIT_END
Just in case someone else runs into that sort of issue, this is how you fix it. Thanks for everyone's help.