The error message “psql: server closed the connection unexpectedly” means that the server terminated abnormally before or while processing the request. This is likely due to the Leader Load Balancer not being available on the port and replication cannot be established. The port that is the problem is 5432, which is the default port for PostgreSQL database connections. The Follower needs to connect to the Leader Load Balancer on this port to receive the replication data from the Leader. If the port is blocked or unreachable, the Follower will fail to sync with the Leader and display the error message. References: [Set up Follower], [Troubleshoot Follower]
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