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Proxy returns "An unknown error occurred"

Joanna | Last updated: Nov 25, 2021 09:22AM UTC

Hi, in a new project I configured a new proxy (intercept off) on port 2020 bound to 127.0.0.1 with a redirect to github.com:443 and enabled it. When access http://127.0.0.1:2020 Burp Suite error page is displayed (https://github.com is expected). In the "HTTP history" tab I can see the request and the correct response coming from github.com but it's not correctly forwarded to the requesting client (e.g. web browser) - instead I get an error. No error is logged in the event log. I'm currently using Burp Suite Professional v20201.10.2 on MacOS 12.x (Monterey). I checked also a Windows x64 version and it has the same issue. What is even more weird is that when I open an old project file created with the previous Burp version (v2021.8.2) the proxy works just fine. Can you please fix it?

Liam, PortSwigger Agent | Last updated: Nov 25, 2021 09:44AM UTC

Hi Joanna, thanks for your message. Would it be possible to provide us with a screenshot of your proxy settings? You can email us at support@portswigger.net. Thanks!

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