PostgresDB 08001: SQLClient Unable to Establish SQLConnection

What is PostgresDB 08001: SQLClient Unable to Establish SQLConnection

Verify the PostgreSQL server is running:For Linux: sudo systemctl status postgresqlFor Windows: Check Services for PostgreSQL Server status.Check the connection details in your application's configuration file, ensuring the hostname, port, username, and password are correct.Test the connection to the PostgreSQL server using psql:psql -h host_name -p port_number -U user_name -W database_nameExamine the PostgreSQL server logs for any errors related to the connection attempt. The location of these logs varies but often found in /var/log/postgresql/ on Linux.Ensure the PostgreSQL server is configured to accept connections from your IP address. Check the pg_hba.conf file for appropriate host entries that match your client's IP address or subnet.Check if the PostgreSQL server's postgresql.conf file is set to listen on the correct interface:listen_addresses = '*' allows listening on all interfaces, or set it to a specific IP address.If on a remote server, ensure no firewall is blocking the connection on the PostgreSQL port (default is 5432). Use telnet or nc to check connectivity:telnet host_name 5432nc -zv host_name 5432Restart the PostgreSQL service to apply any changes made to configuration files:For Linux: sudo systemctl restart postgresqlFor Windows: Restart the service through Services.If using a cloud-hosted database, ensure that the cloud firewall or Security Groups are configured to allow incoming connections on the PostgreSQL port from your IP.