TCPIPSERVICE resource definitions are used to define the association between ports and CICS® services, including CICS Web support. Define and install a TCPIPSERVICE resource definition for each port that you use for CICS Web support.
Each TCPIPSERVICE definition that is active in a CICS system must specify a unique port number. CICS uses the TCPIPSERVICE definition for a port to determine what CICS service should be invoked when it receives an inbound TCP/IP connection request on that port. The PROTOCOL attribute is used to identify the service. HTTP is specified for standard CICS Web support, and USER is specified for non-HTTP requests that are handled using CICS Web support. (The remaining protocols are IIOP and ECI.)
For CICS Web support, you normally need to create TCPIPSERVICE definitions for the default, or well-known, port numbers that are used for Internet services. For HTTP, the default port number is 80, and for HTTPS, the default port number is 443. You can also use non-standard port numbers.
Each TCPIPSERVICE definition can only specify one analyzer program, and one transaction definition for the Web attach task. If you need to use more than one of these items, you will need to use different TCPIPSERVICE definitions, and therefore different ports.
The CICS Resource Definition Guide has information about the different methods of resource definition, and full reference information about all the TCPIPSERVICE resource definition attributes that you will use during this process.