Re-create this problem with a SYSTCPIP component trace active specifying the TC, UDP and IOCTL options and set the debug level on the named server configuration file to 99. Dump the named server address space. See the z/OS Communications Server: IP Diagnosis Guide for instructions on dumping an address space. Obtain the following documentation and contact the IBM® software support center:

• The named server configuration file.
• The SYSLOG DAEMON logging file.
• All configured named logs.
• Use rndc dumpdb to dump the named servers cache to a file.
• The component trace requested. See the z/OS Communications Server: IP Diagnosis Guide for instructions on setting and producing a component trace.
• The dump of the named address space.