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Errors: Skipping phase P1. Too many consecutive "empty response" errors have occurred.

Dan | Last updated: Jun 26, 2023 12:23PM UTC

Hi, I am running a DAST scan using Burp Suite Professional v2023.5.3. I am faced with the following error, which appears for each request that is made (this error is seen in the "Extension driven active audit" section)...so all requests fail with this error: "Errors: Skipping phase P1. Too many consecutive "empty response" errors have occurred." I debug the server code and the test code, and the flow is working as expected, meaning that I get the request from the test, in the server code, and a reply is sent back. But somehow, Burp does not receive/see the reply from the server...hence the error. Any ideas on what I can do / approaches that I could take to continue my investigation / any more details on this error message...I didn't find anything on google on it... Best regards, Dan

Dominyque, PortSwigger Agent | Last updated: Jun 26, 2023 01:17PM UTC

Hi Dan Based on the error reported, you may need to configure your resource pools to control the number of requests you send and how frequently. This is detailed here: https://portswigger.net/burp/documentation/scanner/burp-scanner-error-reference. Additionally, here is the documentation for resource pools: https://portswigger.net/burp/documentation/desktop/automated-scanning/managing-resource-pools I recommend your first initial Custom Resource Pool to have 5 maximum concurrent requests and 300ms delay between requests and enable 'Automatic Backoff.' Please let me know how you get on.

Dan | Last updated: Jun 28, 2023 10:30AM UTC

Hi, I created a new Custom Resource Pool just like you described, however, the behaviour is the same...and all requests fail with the same error message :( Dan

Dominyque, PortSwigger Agent | Last updated: Jun 28, 2023 10:40AM UTC