During this period working on a CyberArk Conjur environment, we experienced a strange behavior during Conjur follower setup.
The setup on the follower was starting, the seed received, imported, and expanded but after some other steps the process was hanging and ending with a generic "System Error".
After the error message, the Conjur follower was restarted.
We did some troubleshooting inside the Conjur Follower pod and we have verified that the Follower was able to connect to the Conjur API leader successfully but it wasn't able to connect to the Postgres database and finish the initial replication.
The correct way to verify the Postgres connectivity from the follower to the leader is the following command:
echo "" | openssl s_client -starttls postgres -connect <lb_DNS>:5432 -showcerts