Windows 10: NCSI Causes no internet issue

I am having a mostly intermittent issue on computers running Windows 10 Pro, Version 2004.


Sometimes the computer shows the globe in the bottom right of the task bar stating no internet connectivity, while there is actually internet connectivity. This is causing issues with certain applications such as communication between Outlook 365 and SharePoint. I have tried all the following steps:


- uninstall network driver and let windows 10 reinstall

- EnableActiveProbing regedit fix

- Flush DNS

- Disconnect from network and reconnect


Sometimes these actions will fix the issue, however it always comes back. Is there a known permanent solution to NCSI?

:)

 

Windows 2004 Force NCSI to say it has internet

Like many other posters here, I have run into issues where the computer thinks it does not have internet due to NCSI failing, even though the computer does in fact have internet. The is causing Office authentication to fail. Is there a way to force NCSI
to think that it always has internet? The computer is always connected to the internet, so false positives won't be an issue.

 

Network Connection Status Indicator (NCSI) Showing No Internet, but Browsing Works Fine.

I am using a Fortigate 100D UTM with 65 PCs connected. 22 of them have this issue. All the PCs are on the same Network / Domain so I find it hard to believe that there is a problem with the Router / UTM Firewall as all PCs would
be showing the same NCSI error.

As for your remaining suggestions; I've done all of these things, multiple times on several different PCs and all returned the same results - NCSI thinks there is No Internet but clicking on the icon resolves the issue, albeit
temporarily (several hours). Windows Troubleshooter does not find anything wrong with the Network Connection or Internet Connection.

If there were issues with the Firewall, NIC, or AV the "No Internet" issue would remain regardless. Clicking on the NCSI icon initiates a probe of the Internet via WinHTTP and the results of that probe satisfies NCSI requirements
and the status is changed.

Do you have any information or perhaps a script to test NCSI using WinHTTP?

 

Network Connection Status Indicator (NCSI) Showing No Internet, but Browsing Works Fine.

22 of 65 PCs are showing No Internet in NCSI, but the Internet is working fine on all 65 PCs

We are experiencing authentication problems (with the 22 PCs) with Office 365 and clicking on the INCS icon removed the "No Internet" warning and the authentication issue goes away (for a while).





I've done considerable research on the operation of NCSI - The URLs are available [www.msftncsi.com ], [http://www.msftncsi.com/ncsi.txt],
[dns.msftncsi.com ], [131.107.255.255.] and the DNS resolves correctly, however I have not been able to test the availability
using WinHTTP. I suspect that's where the problem is.

That said, this is what I've tried:

• Update NIC driver.
• Revert NIC driver.
• Change Buffering in the NIC.
• Confirmed that the Firewall and AV are not the cause.
• Ran Network Troubleshooter - No problem found.
• Confirmed that Network Location Service was running and tried setting to Delayed Start.
• Confirmed that Network Lists Service was running.
• Added [dns.msftncsi.com] to the HOSTS file.
• Disabled "EnableActiveProbing" in the registry - (This gave mixed results)

There seems to be quite a bit of chatter on the web about this problem but no one seems to have a fix. Any help would be greatly appreciated.