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Burp becomes unusable over a Socks proxy

Claymore | Last updated: Dec 16, 2020 02:19PM UTC

When connecting my browser to a Socks proxy I see expected page loading speeds but when I connect my browser to burp and burp to a Socks proxy burp takes forever to get the response and forward it to the browser if at all. This makes spidering and use of passive and or active scanners impossible. I have tried the following: set browser to connect directly to the socks proxy and then load the page (page loads instantly). then change the browser's proxy to point to burp (which is set to use the socks proxy) open up in a new private/incognito window and try and load the page again. this results in the page never loading (burp just says timed out) or me having to send the request multiple times before one request works. using burps built-in browser I have the same issue. Tried multiple networks getting the same results: My Clients proxy creating a socks proxy over SSH between a local VM that goes out my same network connection. creating a Socks proxy over SSH between an amazon instance and my work station. creating a Socks proxy over SSH between a lienode instance and my work station. Please note that when having burp connect to another web proxy as I sometimes have to do for on-site test I don't have this issue only when I need to connect to a socks proxy. can you please provide some guidance on how to fix this issue as it is greatly efficient my use of your product on my engagements?

Uthman, PortSwigger Agent | Last updated: Dec 18, 2020 09:59AM UTC

Hi David, Thanks a lot for reporting this. We will do some investigation and get back to you with any feedback.

Uthman, PortSwigger Agent | Last updated: Jan 11, 2021 09:43AM UTC

Hi David, Can you please send us an email with your diagnostics? Does the issue persist in a different version of Burp?

Uthman, PortSwigger Agent | Last updated: Jan 11, 2021 09:51AM UTC

We have received your email and will do some further investigation. Thanks!

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