All return codes not listed in either Sockets return codes (ERRNOs) or Sockets extended ERRNOs are z/OS® UNIX error condition codes that are not translated to a TCP/IP errno. This is an errno that is received from z/OS UNIX. These errnos are found in the SYS1.MACLIB(BPXYERNO) and are defined in z/OS UNIX System Services Messages and Codes.

For more information about z/OS UNIX error codes, see z/OS UNIX System Services Messages and Codes.