Additional Information
The
Benchmarking Asynchronous Calls.vi example can also be used to confirm LabVIEW is capable of communicating through HTTP. This example sends HTTP GET requests to various URLs via raw TCP calls. Before running the example, create an indicator that displays the return values for the HTTP calls. The example can be found in the
Application Control\VI Server\Asynchronous Call By Reference directory of the example finder.
If this example runs fine (i.e. if the indicator displays valid HTTP responses), then there may be an issue with the code specifically and the SystemLink API. But if this example doesn't return any responses, then your system may still be blocking the network traffic.