PQ97801: FTP REPLY CODE '451 TRANSFER ABORTED: FILE ERROR' DURING LARGE FILE TRANSFER WHEN USING FILETYPE=JES AND ASCII MODE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A FTP client may get a FTP reply '451 transfer aborted: file
  error' on a large file transfer when using filetype=JES and
  ASCI mode.  The FTP client has PUT a JCL on the FTP server for
  JCL to be executed on JES.  The FTP client is waiting for JES
  to generate the output and does a GET to retrieve the output.
  However, it has been found that JES may not be responding fast
  enough and ocassionally zero data will be seen even when the
  data is not EOF.  This zero data can contribute to setting an
  error and nothing happens until the real EOF is being seen.
  At that point, because of the error that happened some time ago,
  the rc_read is set and causes the unexpected 451 transfer
  aborted error.  A FTP server trace will show something like:
  ----------------------------------------------------------------
  ftp> quote site file=jes
  200 SITE command was accepted
  ftp> get ldwview3 ldwviewo(replace
  200 Port request OK.
  125-Submitting job ldwview3 FIXrecfm 80
  125 When JOB00423 is done, will retrieve its output
  <...>
  seq_read_file: no data, not eof, and no error
  MR5705 progressReport: entered
  MF1193 seq_read_file: entered
  MF1208 seq_read_file: calling fread() for up to 92160 bytes
  MF1216 seq_read_file: 0 bytes from fread()
  MF1232 seq_read_file: eof reached
  TO4114 read_stream: 0 bytes read into buffer size 92160
  <..no "250 Transfer completed successfully" message>
  SR2821 reply: entered
  reply: --> 451 Transfer aborted: file error.
  ----------------------------------------------------------------
  

Local fix

• If possible, use EBCDIC data transfer type and BLOCK data
  transfer mode.
  KEYWORDS: EZAFTPTO EZAFTPSR EZAFTPMF JES RC_READ 451 TRANSFER
  ABORTED FILE ERROR
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of z/OS                            *
  *                 Version 1 Release 4, 5 & 6 IP: FTP           *
  ****************************************************************
  * PROBLEM DESCRIPTION: FTP REPLY CODE '451 TRANSFER ABORTED:   *
  *                      FILE ERROR' DURING LARGE FILE TRANSFER  *
  *                      WHEN USING FILETYPE=JES                 *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A FTP client may get a FTP reply '451 transfer aborted: file
  error' on a large file transfer when using filetype=JES.
  The FTP client submits a job to JES and is retrieving the
  sysout. FTP requests the sysout one record at a time. If Jes
  can not respond, we set an error code and retry. If the
  retry is successful, the error code is not reset. When the
  file is complete (eof is received) we exit the loop with the
  erroneous error code. This causes the 451 error reply and
  the received data set is deleted.
  +-------------------------------------------------------------+
  + Please check our Communications Server for OS/390 homepages +
  + for common networking tips and fixes.  The URL for these    +
  + homepages can be found in Informational APAR II11334.       +
  +-------------------------------------------------------------+
  

Problem conclusion

• FTP has been changed to correctly set the return code
  from the get of a Jes sysout file.
  
  * Cross Reference between External and Internal Names
  PREFTPCX (EZAFTPCX)  PREFTPLS (EZAFTPLS)
  

Temporary fix

Comments

APAR Information

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

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

  UQ96190 UQ96191 UQ96192

Modules/Macros

• EZAFTPCX EZAFTPLS EZAFTPTO
  

Fix information

• Fixed component name

  TCP/IP V3 MVS

• Fixed component ID

  5655HAL00

Applicable component levels

• R140 PSY UQ96190

     UP05/02/01 P F501

• R150 PSY UQ96191

     UP05/02/01 P F501

• R160 PSY UQ96192

     UP05/02/01 P F501

Fix is available

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