User's Manual Part 4

Firewall Page 23
Firewall>Services
Services are anything a server provides to other computers. A service can be as simple as the computer
asking a server for the correct time (NTP) and the server returns a response. Other types of services
provide access to different types of data. Web servers (HTTP) respond to requests from clients (browser
software) for access to files and data. Services are used by the SonicWALL to configure network access
rules for allowing or denying traffic to the network.
User Defined (Custom) Services
If protocol is not listed in the Predefined Services table, you can add it to the User Defined (Custom)
Services table by clicking Add.
1. Enter the name of the service in the Name field.
2. Enter the port number or numbers that apply to the service. A list of well know port numbers can be
found in any networking reference.
3. Select the type of protocol, TCP, UDP, or ICMP from the Protocol menu.
4. Click OK. The service appears in the User Defined (Custom) Services table.