This occurs when a firewall or WAF blocks all connections from Acunetix. You probably can still connect to the website from your browser, since the firewall is not blocking your IP address. You will need to confirm that your firewall is not blocking the connection from Acunetix. All Acunetix Online scans are done from

If the target is hosting a web site, you can check the connection from Acunetix by re-verifying the scan target. This will prompt Acunetix to request the verification file, and report back any errors encountered.


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

  • Can you please include a reference of the Acunetix Vulnerability Scanner IPs to allow through the target network’s firewall?

  • We are behind cloudflare and it only allow IP address white list.
    Does have multiple IP address? If yes, are you able to provide the address range?

    • That’s not a problem. Simply white-list This IP address is fixed and does not change.

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