Troubleshoot replication lags in RDS for PostgreSQL

If the firewall is still active, the replica will not be able to access port 5432 In that case, the replica will fail unless there is a replication slot

21:23: CEST ERROR: could not start WAL streaming: ERROR: replication slot my_pub1 is active for PID 730 2021-05

error_ draggable element must have an item slot slot_name my_pub1 plugin pgoutput slot_type logical datoid 16401 database db temporary f active t active_pid

error slot Active: active since Fri 2020–04–10 20:56:32 AEST; 3s pg_basebackup: created temporary replication slot “pg_basebackup_16834”