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In Windows 10, NCSI periodically connects to the site to check if the returned content is the string 'Microsoft Connect Test'.

The issue seems to be connected to a bug that prevents the Network Connectivity Status Indicator (NCSI) to correctly determine if an impacted Windows 10 is connected to the Internet and according to Microsoft's own support site and user reports it has affected multiple Windows versions for years ( 1, 2, 3, 4). While the Windows taskbar tray icon saying "No Internet access" on devices with a working Internet connection should only be a minor annoyance, users might encounter "Please connect your device to the internet" whenever launching apps that rely on Windows APIs to detect Internet connection status. The company is currently investigating this Windbug, with a fix to be delivered to affected devices with a future cumulative update. Windows 10 users have also reported experiencing this issue after upgrading to 2004, with system reboots, router resets, and driver updates not fixing the problem.

"Customers are reporting 'no internet' access in the Network Connectivity Status Indicator (NCSI) on Winddevices on devices that in fact can ping internet resources or browse web sites with internet browsers," a post on Microsoft's TechNet forum describes the issue. Microsoft is investigating a known issue where Windcustomers might see "No Internet access" tray indicators even though their devices are connected to the Internet.