“Connection was terminated by host” indicates that the remote server being scanned is closing the connections being sent to it from Acunetix.  There are several reasons why this might happen, but typically it is encountered when the server cannot handle the number of requests being sent.

To fix this issue, a smaller number of requests should be sent to the server at the same time.  This can be configured as follows:

  1. In Acunetix, browse to the Target’s Configuration > General tab
  2. Decrease the Scan Speed as needed.
  3. Save the settings and try again.

View all the Acunetix FAQs here.


Acunetix developers and tech agents regularly contribute to the blog. All the Acunetix developers come with years of experience in the web security sphere.

  • For some reasons the server keep blocking me. I changed the parallel connections to 1..

    • Hi,

      This blog post documents only one of the possible causes of this issue. If this does not solve the problem, we would need to launch an investigation on why your specific server is closing the connection. Please open a support case by sending an email to support@acunetix.com

  • Any reason why scan https sites, are always end-up with Scan aborted by scanner?

    • Acunetix does not have any issues scanning HTTPS sites. Can you contact Acunetix support so we can identify why Acunetix is failing to scan your HTTPS sites?

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