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Security Rule - Service Not Equal to Any - Interpreting BPA Checks - Policies
This video provides information about why you want to specify the application and services port is set to prevent malware from accessing the network through open ports.
The "service not equal to any" column checks to see if a specific service/port is configured for a security policy rule. The best practice assessment check ensures the service field is set to a specific port or to an application-default.
For more information on application-default under service, please review the following articles: