If message EZZ8254I was displayed prior to this message, use the errno and errnojr from that message to determine the cause of the failure. If no message EZZ8254I is displayed, TCP/IP could not allocate storage for an IOCTL request. If so, issue DISPLAY TCPIP,,STOR command to determine current storage usage and limits. Save the system log and request a dump for problem determination. See the z/OS Communications Server: IP Diagnosis Guide for more information.