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Skipping phase s1. empty response errors have occurred

3iyakebouty | Last updated: Nov 14, 2023 10:46AM UTC

Scanning a corporate website using the active scanner resulted in too many consecutive error messages "Skipping phase s1. empty response errors have occurred". The default setting for the active scan resource pool is a maximum of 10 concurrent requests. I ran a test scan with the same settings on "https://ginandjuice.shop/" and this one scanned successfully with no errors and no problems. What caused this error? Even if it is an error, is the scan still successful?

Syed, PortSwigger Agent | Last updated: Nov 14, 2023 02:20PM UTC

Hi,

I am sharing the following scanner error reference document with you: https://portswigger.net/burp/documentation/scanner/burp-scanner-error-reference#:~:text=errors%20have%20occurred.-,Cause,-Burp%20Scanner%20identifies

You can always use this to identify what an error means and what to do about it.

In this particular case, it looks like either we are getting throttled by the server/proxy/firewall or we are simply sending too many requests for the server to respond to. You can reduce the number of concurrent requests and even add a bit of delay between the requests so that the server isn't overwhelmed by too many requests.

Please run a new scan with these changes and let me know how it goes. Have you seen any other errors or Debug messages in the Event log?

3iyakebouty | Last updated: Nov 15, 2023 01:58AM UTC

thank you Maximum concurrent requests 1 Delay between requests 1000milliseconds The same error occurs when I run the scan with

Syed, PortSwigger Agent | Last updated: Nov 15, 2023 10:55AM UTC