Mainframe-based communications support provides transport-level functionality. Depending on the mainframe communications software installed, Gateway-Library uses SNA or TCP/IP for z/OS.
For SNA environments, you can use the SNA General Trace Facility (GTF) files to trace SDLC/SNA traffic between Gateway-Library and the mainframe. The IBM TAP utility extracts this information.
For CICS TCP/IP environments, you can use the Netstat facility to check the status of TCP/IP connections, as well as to deactivate them if problems occur.
You can use the TCP/IP trace facility to trace traffic between DirectConnect and the mainframe.
The Sybase listener transaction provides the interface between CICS and z/OS/TCP. The listener enables CICS applications to use the following TCP/IP communication facilities:
The IBM-supplied TCP/IP Listener transaction to initiate transactions when operating with TCP/IP devices, such as DirectConnect.
The TCP/IP Sockets Interface provides CICS user exit traces, denoting each TCP call issued and the associated return call.
The Sybase listener TRACE parameter and the Server Option DEBUGSW parameter settings provide CICS user exit traces, denoting each TCP call issued and the associated return call.
For CICS, Gateway-Library tracing stores information on the TDS traffic between the mainframe and server in the VSAM ESDS file, SYTDLOG1. This information includes any errors detected in the traffic.
When turned on, the Server Option Trace flag enables the Server Option-TCP/IP interface to write user trace points to the CICS Message User log (CSML) as well as the CICS Aux trace facility.
Some TD calls fill up internal TDS buffers before sending them out to the network. For example, a TDSNDROW or TDSNDMSG call does not cause execution of a corresponding CICS EXEC SEND call, unless the TDS buffer becomes full.
WARNING! To avoid losing records, periodically archive or delete the trace records on SYTDLOG1. Trace records append to this file until it is full, when it rejects any further records.
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