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The Network Connection Status Indicator (NCSI) is part of NlaSvc ( Network Location Awareness Service) and it basically serves the purpose of checking if we can reach Internet or not: the check is performed using the NLM_CONNECTIVITY Network List Manager native APIs ( read here for more info). The applications and services installed on our system can fetch the result of these checks from the APIs NCSI/NlaSvc to determine the most suited / stable network among the available ones according to our needs. Network Connection Status Indicator (NCSI)
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What we need, like you might guess, is mostly the latter: if you feel like you need more information regarding the former, you can find some detailed information on the Network Location Awareness (NLA) service looking at this great post. to check if the network features internet access or not.to automatically identify the network and fetch its basic informations.When a Windows PC connects to a network - be it public or private - two services will be used to analyze its status: the Network Location Awareness (NLA) and the Network Connection Status Indicator (NCSI). What's the reason behind this odd behaviour by Windows? In this post we'll try to answer to this question, looking at how our (not always) beloved operating system checks our connection status and how to solve the most common issues. That's not always true tho: sometimes, despite the yellow triangle and the message, your PC is indeed connected and you can surf the web without issues.
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The meaning of that is as simple as the popup label appearing on mouse hover: the system is connected to a network, but there's no internet access. Hands up if you've seen the dreadful "yellow triangle" on your systray network icon at least once.
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