jackc/pgx · error · ConnectError

hostname resolving error: %w

Error message

hostname resolving error: %w

What it means

Error "hostname resolving error: %w" thrown in jackc/pgx.

Source

Thrown at pgconn/pgconn.go:158

// If config.Fallbacks are present they will sequentially be tried in case of error establishing network connection. An
// authentication error will terminate the chain of attempts (like libpq:
// https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-MULTIPLE-HOSTS) and be returned as the error.
func ConnectConfig(ctx context.Context, config *Config) (*PgConn, error) {
	// Default values are set in ParseConfig. Enforce initial creation by ParseConfig rather than setting defaults from
	// zero values.
	if !config.createdByParseConfig {
		panic("config must be created by ParseConfig")
	}

	var allErrors []error

	connectConfigs, errs := buildConnectOneConfigs(ctx, config)
	if len(errs) > 0 {
		allErrors = append(allErrors, errs...)
	}

	if len(connectConfigs) == 0 {
		return nil, &ConnectError{Config: config, err: fmt.Errorf("hostname resolving error: %w", errors.Join(allErrors...))}
	}

	pgConn, errs := connectPreferred(ctx, config, connectConfigs)
	if len(errs) > 0 {
		allErrors = append(allErrors, errs...)
		return nil, &ConnectError{Config: config, err: errors.Join(allErrors...)}
	}

	if config.AfterConnect != nil {
		err := config.AfterConnect(ctx, pgConn)
		if err != nil {
			pgConn.conn.Close()
			return nil, &ConnectError{Config: config, err: fmt.Errorf("AfterConnect error: %w", err)}
		}
	}

	return pgConn, nil
}

View on GitHub (pinned to ec1a0befd2)

When it happens

Trigger: Thrown at pgconn/pgconn.go:158 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of jackc/pgx@ec1a0befd2 (2026-08-04). Data as JSON: /data/errors/c44b05f77f1e2322.json. Report an issue: GitHub.