Per the suggestion in the Feedback Request, try importing the System.Net.NetworkInformation namespace and use the following code snippet to check if the network is available.
import System.Net.NetworkInformation; // Place at the top of the FiddlerScript file, i.e. CustomRules.js
NetworkInterface.GetIsNetworkAvailable() // Use this to check if the Network is available anywhere in the script.
Please give this a try and let me know the results. Thank you and I look forward to your reply.
Eric R | Technical Support Engineer
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