IV27716: FTPD MESSAGES FOR NLST ON EMPTY DIRECTORY NOT RFC COMPLIANT APPLIES TO AIX 6100-08

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The ftp raw command NLST when used to list the contents
  of an empty remote (i.e. server) directory does complete
  with a 226 completion message, but that message is not
  preceded by the data connection operations and the
  150 or 125 messages that report those operations
  and which RFC 959 requires.
  
  This would typically affect embedded ftp clients that are
  programmed to expect that sequence, resulting in their
  unnecessarily reporting a failure or even disrupting a
  batched sequence of data transfer operations.
  

Local fix

Problem summary

• When executing NLST FTP sub-commnand on an empty directory in
  AIX FTP server, some FTP clients may hang. This is because AIX
  FTP server sends 226 completion message, but that message is
  not preceded by the data connection operations and the 150 or
  125 messages that report those operations and which RFC 959
  requires.
  

Problem conclusion

• Modified FTP server code to open a data connection and send 150
  or 125 message if data connection succeeds, or 425 message if
  data connection fails, even when NLST command is run on an
  empty directory.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IV25437

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  AIX 610 STD EDI

• Fixed component ID

  5765G6200

Applicable component levels

• R610 PSY U846293

     UP12/10/23 I 1000

PTF to Fileset Mapping

• U846293 bos.net.tcp.client 6.1.8.0