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Windows does indeed check a Microsoft site for connectivity, using the Network Connectivity Status Indicator site. There are a few variations of the connection checking process: 1. NCSI performs a DNS lookup on http://www.msftncsi.com/ncsi.txt, then requests http://www.msftncsi.com/ncsi.txt. This file is a plain-text file and contains only the text Microsoft NCSI. 2. NCSI sends a DNS lookup request for dns.msftncsi.com. This DNS address should resolve to 220.127.116.11. If the address does not match, then it is assumed that the internet connection is not functioning correctly.
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\NlaSvc\Parameters\Internet]"EnableActiveProbing"=dword:00000001 -- Turn this to "0" to disable the testing"ActiveWebProbeHost"="www.msftncsi.com" -- The domain to find the test file"ActiveWebProbePath"="ncsi.txt" -- The name of the test file"ActiveWebProbeContent"="Microsoft NCSI" -- The expected text in the test file (remember to not have an EOL)"ActiveDnsProbeHost"="dns.msftncsi.com" -- The dns server to poll"ActiveDnsProbeContent"="18.104.22.168" -- The IP address for the dns server to poll
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