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Why does Proxy access logs show requests for http://www.msftncsi.com/ncsi.txt?

Posted on May 22nd, 2011 by Bert Zefat

Q: Why does my ProxySG access logs show many requests for http://www.msftncsi.com/ncsi.txt?

A: Windows Vista and 7 system includes a Network Connectivity Status Indicator (NCSI) check. What this workstation will do is make a request for http://www.msftncsi.com/ncsi.txt . If the OS gets a response, then it assumes that the PC has internet connectivity. If it cannot reach http://www.msftncsi.com/ncsi.txt, then the OS will assume that internet connectivity is down.

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