/sys$common/syshlp/TCPIP$UCP_HELP.HLB  —  SET  CONFIGURATION  PROTOCOL  TCP Qualifiers, /PROBE_TIMER
       /PROBE_TIMER=n

    Optional. Default: 75 seconds.

    Number of seconds between probes for idle TCP connections (when
    the SO_KEEPALIVE option is set). If the remote system fails to
    respond, the connection is removed. Also, when initiating a TCP
    connection request, indicates the maximum number of seconds that
    the software waits for a response from the remote system before
    the request times out.
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