When creating firewall rules in the Security Configuration Wizard (SCW), you can select which services are restricted by the firewall rule. To use a firewall rule to restrict a service, choose a service from the list of services. Each firewall rule can restrict only one service.
The services list includes the name of services on your server as well as their short name. A service is an application type that runs in the system background without a user interface. Services provide core operating system features, such as Web services, event logging, file services, printing, cryptography, and error reporting.