Enabling TCP/IP in a CICS region

TCP/IP support is provided by the CICS® sockets domain, with network services supplied by z/OS®. The sockets domain provides support for:

The listener
The listener monitors specified TCP/IP ports for incoming requests. It is configured by a TCPIPSERVICE resource definition to listen on a specific TCP/IP port and to attach a specified request receiver transaction to handle each connection. Once the connection has been established between a client program and a particular request receiver, all subsequent requests from the client program over that connection flow to the same request receiver. The listener supports user applications initiated by TCP/IP services for the following protocols:
External Call Interface (ECI)
The External Call Interface (ECI) allows client applications to use TCP/IP directly to CICS regions without any intervening products such as protocol-mapping software. The External Call Interface (ECI) is supported, but not the External Presentation Interface (EPI).

See the CICS Family: Communicating from CICS on System/390® manual for information about the External Call Interface.

Hypertext Transfer Protocol (HTTP)
HTTP messages are received and sent over the Internet, using CICS Web support. See the CICS Internet Guide for information about the transmission of HTTP messages on the Web.
Internet InterORB Protocol (IIOP)
IIOP messages are sent between client and server applications that conform to the Common Object request Broker Architecture (CORBA). See the Java™ Applications in CICS manual for information about IIOP messages.
Outbound socket support
This allows CICS to initiate an IP connection. Sockets can be created by one task, shared by other tasks, and remain active after task termination, for re-use by another task.
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