IBM Support

MA48948 - LIC-COMM-TCPIP RST FOR INCOMING DATA ON CLOSED SOCKET WITH DATA
QUEUED TO SEND

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 APAR (Authorized Program Analysis Report)

Abstract

LIC-COMM-TCPIP RST FOR INCOMING DATA ON CLOSED SOCKET WITH DATA
QUEUED TO SEND

Error Description

When the i series is working as FTP client, RST is sent instead
of FIN. Error 426-Unable to receive data from TCP/IP, 426-Data  
transfer ended.                                                
After the local socket is closed and TCP is lingering to send  
data queued prior to the close, TCP sends a RST packet in      
response to incoming data. Secure FTP client hit this TCP      
issue. The remote FTP side sees error 426-Unable to receive    
data from TCP/IP, 426-Data transfer ended.                      

Problem Summary

Please see the ERROR DESCRIPTION section.                      

Problem Conclusion

The TCP code path sending the RST was updated so that if TCP is
lingering to send data queued before the local socket is closed,
it now ACKs the incoming packet up until the FIN is sent and    
then acknowledged by the remote side.                          

Temporary Fix

Comments

Circumvention


PTFs Available

R730 MF68512  1245

R740 MF68511  1238

Affected Modules


         
         

Affected Publications

Summary Information

Status............................................CLOSED PER
HIPER...........................................No
Component..................................9400DG3TC
Failing Module..........................RCHMGR
Reported Release...................R740
Duplicate Of..............................




IBM i Support

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Document Information

Modified date:
10 September 2021