You can configure an NSService and specify parameters for matching network traffic such as a port and protocol pairing. You can also use an NSService to allow or block certain types of traffic in firewall and DNE (distributed network encryption) rules.
An NSService can be of the following types:
L4 Port Set
An L4 Port Set supports the identification of source ports and destination ports. You can specify individual ports or a range of ports, up to a maximum of 15 ports.
An NSService can also be a group of other NSServices. An NSService that is a group can be of the following types:
Layer 3 and above
You cannot change the type after you create an NSService. Some NSServices are predefined. You cannot modify or delete them.