Enabling TCP/IP in a CICS region
The CICS® sockets domain provides TCP/IP support, with network services supplied by z/OS®.
About this task
The sockets domain provides listener support and outbound
sockets support.
- The listener
- The
listener monitors specified TCP/IP ports for incoming requests. You
configure the listener with a TCPIPSERVICE resource definition to
listen on a specific TCP/IP port and to attach a specified request
receiver transaction to handle each connection. When 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 ECI allows client applications to use a TCP/IP connection directly to a CICS region. The External Presentation Interface (EPI) and External Security Interface (ESI) are not supported.
- Hypertext Transfer Protocol (HTTP)
- HTTP messages are received and sent over the Internet, using CICS web support. See HTTP request and response processing for CICS(r) as an HTTP client for information about the transmission of HTTP messages on the web.
- IP interconnectivity protocol (IPIC)
- Intercommunication facilities available using IPIC
- Outbound sockets
- Outbound socket support allows CICS to open sockets and communicate using one of the supported TCP/IP networking protocols, for example, HTTP or IPIC.