APPCCMD CONTROL=REJECT is used when a severe error indicates that data will not flow properly on the session. For example, an application program is informed through the LOGRCV field that the application program is to receive error log data. If the application program fails to receive the data, an APPCCMD CONTROL=REJECT macroinstruction is issued. (For details on the syntax and operands for the macroinstruction, refer to z/OS Communications Server: SNA Programmer's LU 6.2 Reference.)

When application programs issue the APPCCMD CONTROL=REJECT macroinstruction, they must specify an UNBIND sense code describing the nature of the error.