PostgresDB 08003: Connection Does Not Exist

What is PostgresDB 08003: Connection Does Not Exist

Verify the connection parameters (host, port, database name, user, and password) to ensure they are correct. Use the psql command to attempt a manual connection:psql -h <host> -p <port> -U <user> -d <database>Check the PostgreSQL server status to ensure it's running. Use the following command (adjust for your system service manager if not using systemd):sudo systemctl status postgresqlIf the server is running but you still can't connect, verify that PostgreSQL is listening on the expected port and network interface:sudo ss -tnlp | grep postgresEnsure the pg_hba.conf file has appropriate entries for your connection type (host, local, etc.) and that your user is allowed to connect from your current IP address.Check the PostgreSQL logs for any error messages related to your connection attempt. The log location may vary, but you can start with:sudo less /var/log/postgresql/postgresql-<version>-main.logIf you're connecting from a remote location, ensure that the server's firewall (e.g., iptables, ufw) allows incoming connections on the PostgreSQL port (default is 5432).Lastly, if using a connection pooler or proxy, ensure it's running and configured correctly to forward connections to PostgreSQL.