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Check Internet access (HTTP method)

Determine whether or not Internet access is available by attempting an HTTP connection to the "Microsoft Network Connectivity Status Indicator" (NCSI) web service.

LabVIEW RT block diagram: Attempt to open an HTTP connection to the Microsoft Network Connectivity Status Indicator (NCSI) web service as indicator of Internet access

Use cases


Keep in mind

LabVIEW block diagram elements

Locate these elements with "Quick Drop" (press Ctrl+Space and start typing the name); click on an icon to see more sample code that uses that element:


Example code

Expected results

https://youtu.be/ZzVKf0BaZDM (1:52)

Developer walk-through

https://youtu.be/edhLgSWN3og (3:15)


For more information

  1. Appendix K: Network Connectivity Status Indicator and Resulting Internet Communication in Windows Vista (https://technet.microsoft.com/en-us/library/cc766017)
    A complete discussion of the Microsoft NCSI web service.
  2. "check internet connection" thread on NI Community Forum (http://forums.ni.com/t5/LabVIEW/check-internet-connection/td-p/1724074)
    The original idea for the example code presented here.