This article explains your firewall's whitelist Crashtest Security Scanners, so your scan can run normally.
Security Scanning is a sensitive issue that sometimes needs to be conducted for applications that are not publicly available. To configure your network perimeter to allow our security scanner to access your applications, we provide a set of static IP addresses. All requests from our security scanning engine originate from one of these IP addresses.
You may whitelist these IP addresses within your firewall or load balancer so that the security scanner can access your private applications, such as your staging system or internal applications:
Here are the IP addresses as a comma-separated list for easier copying into your firewall settings: