What is Fiddler and how do I use it to capture network traffic?

Fiddler sits between the client and server and captures all communications over HTTP and HTTPS between the two, offering more detail into the network calls at the time of the issue.

Fiddler Classic can be downloaded at https://www.telerik.com/fiddler/fiddler-classic and installed as described in https://docs.telerik.com/fiddler/configure-fiddler/tasks/installfiddler  

Instructions to capture the network traffic are presented in: https://learn.microsoft.com/en-us/power-query/web-connection-fiddler

When running FiddlerCap, please intentionally try to reproduce the issue, and be sure to make use of the built-in screen shot tool as soon as you encounter the behavior so we can see the network calls just prior.

Please attach the resulted *.saz file to the service request.