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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

Hi Zac, You need to use a different port to the one that WebGoat is using. For example, you could set Burp to the default 8080 and update this in Firefox too. Once you have done that, simply navigate to WebGoat and the traffic should appear in the HTTP History in Burp.

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