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Invalid client request received: Dropped request looping back to same Proxy listener

Zac | Last updated: Feb 22, 2021 05:49PM UTC

I have WebGoat running locally on port 9300 (so accessible via localhost:9300). When I configure a BurpSuite proxy listener to listen on port 9300, and then configure FireFox to point to a proxy also on 9300, and then I navigate to http://localhost:9300/WebGoat (which should be the WebGoat login page), I get the following error: Invalid client request received: Dropped request looping back to same Proxy listener Looking at https://forum.portswigger.net/thread/invalid-client-request-received-dropped-request-looping-back-to-same-proxy-listener-4bfc75c5, it seems I need to change the ports a bit to avoid an infinite loop, but what exactly do I need to change here? I have exported my certs and added them to Firefox as well.

Uthman, PortSwigger Agent | Last updated: Feb 23, 2021 09:53AM UTC