PK02231: FTP CLIENT ISSUES PUT AND GETS MSG 552 CONNECTION RESET BY PEER 05/04/08 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When issuing a PUT to a remote site, FTP generates a SITE
  command. If the remote site is not a z/OS server, then the
  remote site may reject this command resulting in FTP
  detecting an error condition.
  In this case, the remote server did not have the SITE command
  
  implemented and returned:
  502 SITE command not implemented.
  
  When the STOR command is issued, normal data transfer will
  occur. At the end of data transmission over the data
  connection, instead of terminating the connection with a FIN,
  FTP terminates the data connection with a reset.
  
  The remote server should be interpreting this result as an
  incomplete (failed) data transfer and should respond over
  the control connection with an error reporting that the
  client has reset the connection with a message similar to the
  following:
  552 9950ad201001: Connection reset by peer.
  ADDITIONAL SYMPTOMS:
  The server reply may be:
  426 Connection closed; transfer aborted.
  426 Data connection: A connection with a remote socket was reset
  by that socket.
  

Local fix

• Prior to the PUT command, enter the SENDSITE command to
  suppress generation of the SITE command.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of the IBM Communications Server   *
  *                 for z/OS Version 1 Release 4 IP:FTP Client   *
  ****************************************************************
  * PROBLEM DESCRIPTION: When issuing a PUT to a remote site,    *
  *                      FTP may generate a SITE command.  If    *
  *                      the remote site is not a z/OS server,   *
  *                      then the SITE command fails resulting   *
  *                      in the FTP client setting an error code *
  *                      that is not cleared before the command. *
  *                      This will result in next command        *
  *                      failing.                                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The error code in ftip->err was being cleared in multiple
  places.  The client, EZAFTPSC, getReply() needs to be updated
  to always clear or set ftip->err correctly after each reply.
  +-------------------------------------------------------------+
  + 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

• The FTP client has been corrected.
  
  * Cross Reference between External and Internal Names
  PREFTPCX (EZAFTPCX)
  

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:

  UK01739

Modules/Macros

• EZAFTPCU EZAFTPCX EZAFTPPC EZAFTPSC
  

Fix information

• Fixed component name

  TCP/IP V3 MVS

• Fixed component ID

  5655HAL00

Applicable component levels

• R140 PSY UK01739

     UP05/04/27 P F504 «

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.