margin windows or ads won't load and only say there's no network connection. ran a connectivity scan but nothing was found. I figure its a setting of sorts but don't know which one or how to fix

When I go to my home page or various web pages there are ads link boxes that never load a picture or anything. They just have a notice that the page could not be loaded. usually it says it can't connect to the internet and to check internet connectivity. when I do it runs a scan that comes back saying there were no connectivity issues.