| Value | Description |
|---|---|
| 0 | No checking is done. |
| 1 | z/Server issues the following command (visible in SYSTSPRT DD statement):
D TCPIP,,N,CONN,PORT The command response can be found in the hardcopy log. When the port is not available, for instance, when it is in status LISTEN, TIMEWT, or FINWT2, the response to the DISPLAY command is useful for analysis. |