Verificando meu log do SQL Server, vejo várias entradas como esta:
Date: 08-11-2011 11:40:42
Source: Logon
Message: Login failed for user 'sa'. Reason: Password did not match for the login provided. [CLIENT: 56.60.156.50]
Date: 08-11-2011 11:...
08.11.2011 / 13:14