How to I make sure that I have set up a secure internet connection on my macbook pro? Our internet has been running slower the past month or so and I want to be sure I have not left my internet unsecured for someone else to log on and use. When I check the "rainbow" at the top of my screen there are usually about 6 people listed and they all have a lock after their names. Our just has our last name with a checkmark. Does that mean it is secure?