EZZ9599I

Explanation
 A setsockopt call with the IPv6_V6ONLY option
failed. 
 socket_descripitor is the socket
descriptor of the socket affected by the  failing call. 
 errno is
the hexadecimal z/OS® UNIX System Services return code.
These return codes are listed and described in the return
codes (errnos) information in z/OS UNIX System Services Messages and Codes.
 errnojr is the
hexadecimal z/OS UNIX System Services reason code. The format
of the 4-byte reason code is explained in the introduction to the reason codes (errnojrs) information of the z/OS UNIX System Services Messages and Codes, where the reason codes are listed.

System action
 The named server continues.  IPv4 data
sent to the named server might be  received on an IPv6 socket
as an IPv4-mapped IPv6 address.  Consequently, any  named.conf options
that see the pure IPv4 address form (in an address  match list, for
example) will not take effect on the intended data because the  named server
is using an IPv4-mapped IPv6 address instead of the pure IPv4  address.

Operator response
 Notify the system programmer.

System programmer response
 Ensure that the TCP/IP stack is IPv6
enabled in the BPXPRMxx SYS1.PARMLIB  member.

Module
 ISCSOCKT

Procedure name
  isc_socket_create