Remote client can't connect

Check: listen_addresses; pg_hba.conf; cloud firewall. Fix: All three must allow it — closed by default is the design.

Password auth fails for new role

Check: pg_hba.conf method line. Fix: Use scram-sha-256 entries for network clients; reload.

Check: SELECT pg_size_pretty(pg_database_size(...));. Fix: Grow the volume; autovacuum settings for bloat.

Troubleshoot PostgreSQL 16 (Hardened) — DC Associates Group Docs

Symptom	Check	Fix
Remote client can't connect	listen_addresses; pg_hba.conf; cloud firewall	All three must allow it — closed by default is the design.
Password auth fails for new role	pg_hba.conf method line	Use scram-sha-256 entries for network clients; reload.
Disk filling	SELECT pg_size_pretty(pg_database_size(...));	Grow the volume; autovacuum settings for bloat.

Logs & useful commands

/var/log/postgresql/postgresql-16-main.log; `journalctl -u postgresql -f`
Health: sudo -u postgres pg_isready → 'accepting connections'
First boot state: Cluster is initialized by the distro packages; service enabled. Ready when pg_isready succeeds (seconds after boot).

Still stuck? Email support@dcassociatesgroup.com with the product name, cloud + region, instance size, and the output of the health command — first response within 1 business day, most tickets same-day.