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Hands up if you've seen the dreadful "yellow triangle" on your systray network icon at least once. 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. 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.

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. Their purpose respectively is:. 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 Technet.

The Internet Connection check is actually made by using a standard DNS call: the outcome, if less than ok, will be displayed by using an overlay icon - the yellow triangle, the red cross, and so on - over the network icon in the systray : it's worth to notice that this is an overall result for all the available networks - that's because the network icon is the same - focusing on the most troubled one.

This basically means that, if you get the yellow triangle but the web seems to be working just fine, the first thing you should do would be to disable all the other network interfaces using the Control Panel and see if you manage to identify the one causing the issue.

Since Windows 7, the connectivity test performed by NCSI is part of Windows DirectAccess read here if you never heard about it and it features the frequent activity of some active probes sending an almost-realtime notification whenever any network connection's status changes: on each connection, NCSI checks if the computer is connected to the Internet by issuing a standard DNS query to www.

These checks can be easily identified and monitored with a network tracing software such as Network Monitor o Wireshark. If you don't feel like installing new software on your system you can also perform the test using the netsh console command available since Windows 7 : to do that, just open an elevated command prompt and run the following code:.

If you need to trace the network activity during the system boot sequence, change the above command setting the persistent parameter to yes : this way te trace will continue - even after a shutdown or reboot - until you'll manually stop that issuing the following command:. The network activity log will be put into the netsh-trace.

For additional info on the netsh trace command and hints on how to effectively use it I also suggest you to read this post. Whenever there are other applications generating network traffing, the NCSI service will silently switch to passive mode, checking the completion of the TCP connections estabilished by the other software instead of using its own probes, and act accordingly. If you're ok with that, you can either reconfigure some of its features or shutdown it entirely without affecting the stability of your system as it's considered a non-critical service.

A useful thing for most users would be to reconfigure the active probes sent to the default Internet address www. You can either:. For additional info regarding the active and passive probes and how they actually work, we strongly suggest you to read this excellent Microsoft KB article. A NCSI server is nothing more than a web application hosting a text file. Once you did that, go to the regedit and navigate thru the following key:. These are the settings you need to change to re-route the probes to your webserver's.

Depending on your network configuration settings, it could be also required to create a dedicated DNS zone for the webserver's domain name in order to make it available to your internal network. November 22, November 22, November 14, January 22, June 12, June 12, Since it's also a lead designer for many App and games for Android, iOS and Windows Phone mobile devices for a number of italian companies.

Thanks for the article. My only work around is to disable the network card and re-enable it and everything works again. Not sure why this happens. Using Windows 10 I have to disconnect and try again and again, sometimes If I simply leave it , within some minutes the yellow icon status changes to access to internet. Any ideas on how to repair this? Thank you. Your email address will not be published. Aggiungi e-mail alla newsletter.

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