SELECT 
	COUNT(b.IP) AS Total
FROM 
	baneos b 
	LEFT JOIN Usuarios u 	
		ON b.IP = u.Last_IP
WHERE 
1 = 1 
		AND b.IP 				= '216.73.217.21' 
		AND u.Last_IP 			IS NULL 
		AND current_timestamp() <= DATE_ADD(_DateCreated,
 INTERVAL HoursBanned HOUR)
		AND (LEFT(IFNULL(b.QueryString,
 ''),
 13) <> 'LOGIN_FAILED:'
		OR '/producto.asp' IN ('/login.asp',
 '/login_carrito.asp'))

-2147023878

Intento de operación ilegal en una clave del Registro que estaba marcada para su eliminación.