Unable to obtain SSL certificate: Bad server response; is a LookupService listening on the given address?
Some googling led me to:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2085155
The VMWare KB did not help as the vcenter and the new appliance could resolve each others by the FQDN.
Then I came across:
http://www.davidhill.co/2015/03/vsphere-replication-unable-to-obtain-ssl-certificate/
This was an interesting post since he mentions we need to enter the address for the LookupService Address and this does not match the actual VMWare documention which says the following:
In the LookupService Address text box, enter the IP address or domain name of the server where the lookup service runs.
Using the vcenter address did not work for me. However, using the platform service controllers FQDN did work. The configuration ended up working for me with either the FQDN of the Platform Services Controller or the full URL to the Lookup Service also pointing at the PSC. So if you are in these shoes try:
[FQDN_vCenter_Platform_Services_Controller]
and if that does not work, you can also try it with the full address:
https://[FQDN_vCenter_Platform_Services_Controller]:7444/lookupservice/sdk