VMware Cloud Director Availability 4.7.3
This issue can occur when the connection to the configured Public Service Endpoint address is not accessible from the on-premises appliance.
To resolve the issue engage with your network team and ensure that on-premises appliance is able to communicate on port 443 to the configured Public Service Endpoint.
To test the connection from the on-premises appliance to the Public Service Endpoint, the following commands can be run from the on-premises appliance.
openssl s_client -connect <Public Service Endpoint address>:443 </dev/null 2>/dev/null
curl -kv https://<Public Service Endpoint address>:443
Configure the On-Premises to Cloud Director Replication Appliance