PH08020: CHANGES REQUIRED TO REACT TO NEW ERRNO STATUSES ISSUED BY AT-TLSDURING COMMUNICATION USING A TCP SOCKET.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When AT-TLS is being used to secure a connection between IIDR
  CDC for z/OS and either the MC Client or a replication partner
  system, there are conditions under which AT-TLS will forward an
  indication of available socket data to the TCP API even though
  there is no data to be received.  This causes a select() call to
  end with an indication of available data.  When the subsequent
  recv() or recvmsg() API call is issued to obtain the data,
  EWOULDBLOCK is returned by the TCP/IP API.  EWOULDBLOCK is not
  acceptable because the sockets have been set to non-blocking
  mode, and after the indication of arriving data, the TCP API
  should then present the data.  IIDR CDC for z/OS closes the TCP
  connection after indicating that an error has occurred.
  

Local fix

• No local fix is available.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of IIDR CDC for z/OS who use AT-TLS to *
  *                 encrypt communications.                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: If AT-TLS is being used to encrypt data *
  *                      and network errors occur, then message  *
  *                      CHC9500E with an errno of EWOULDBLOCK   *
  *                      is issued and the connection is lost.   *
  ****************************************************************
  * RECOMMENDATION: APPLY CORRECTIVE SERVICE                     *
  ****************************************************************
  
  EWOULDBLOCK may be returned by AT-TLS if is is being used to
  encrypt data on connections.
  

Problem conclusion

• Changes have been made to work with new errnos from AT-TLS where
  it had been returning EWOULDBLOCK.  Coordinated maintenance must
  be applied to AT-TLS so that it will handle the connectivity
  issues with a more specific errno value than EWOULDBLOCK.
  

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:

  UI61456

Modules/Macros

•    CHCCITTC
  

Fix information

• Fixed component name

  INFO SRVR CDC Z

• Fixed component ID

  5655U7600

Applicable component levels

• RA21 PSY UI61456

     UP19/03/07 P F903

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.