The current implementation of Fiddler was not intended to work in a sandbox. Fiddler opens a port to listen for HTTP requests and changes the proxy settings of the operating system. You also need to install a certificate in order to capture HTTPS traffic. All those things might (and are most likely) be limited or restricted in sandbox.
The windows sandbox is just a lightweight VM that persists no changes.
I had no issues installing the certificate.
Can you suggest how I can verify that the proxy setting changes?
OK, it looks like the issue is that the sandbox won't allow the proxy to be set. I tried manually setting it to 127.0.0.1:8888 but saving it didn't work.
I'd like to test Fiddler out using the Windows Sandbox feature. I have fiddler installed in the sandbox, but when I run explorer or edge in the sandbox, fiddler captures nothing.
I am able to use the get feature, for example for https://southjersey.craigslist.org/, successfully