Debugger Not Working for Week 4 HTTP Transport Barrier Walkthru

Hi all

For some reason, when I do the HTTP transport barrier walkthru, I cannot get the Mule app in Debug mode to step through the flows properly. When it gets to the HTTP request in the main flow and then I try to step down to the HTTP listener in flow2, it times out. I then get an "Error sending HTTP Request" returned to Postman if I try to step again.

However, if I run the Mule app normally, everything works fine, and the correct response is sent back to Postman.

Is there any reason why the Mule app would behave differently in Debug mode than in Run mode?

Thank you.