IZ66692: Fully Managed .NET client fails with Probe ID CO052000 and error message AMQ9207 in the logs.

WebSphere MQ V7.0 Fix Pack 7.0.1.2
WebSphere MQ V7.0.1 for i5/OS Fix Pack 7.0.1.2

APAR status

• Closed as program error.

Error description

• An exception with Probe ID CO052000 is produced in the fully
  managed .NET client during an MQ API call when receiving data
  from the remote end. The FFST contains invalid data when
  attempting to read a TSH segment from the socket. The TSH was
  missing from the data on the socket.
  An error message AMQ9207 is also found in the logs.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Any users of WebSphere MQ using the fully-managed .NET client.
  
  Platforms affected:
  Windows
  
  ****************************************************************
  PROBLEM SUMMARY:
  The problem was caused by a programming error when reading data
  from the socket. The documentation for the socket.Receive call
  states 'the Receive method will read as much data as is
  available, up to the number of bytes specified by the size
  parameter'. Therefore, it may read less bytes than the size
  parameter. The fully managed .NET client was issuing 1 Receive
  call on the socket and assuming that an entire MQ message
  segment was present. However, due to high network latency and
  large message sizes, an incomplete TSH segment was present on
  the socket at the time the first call was issued. As a result,
  a subsequent Receive call retrieved the second half of the
  incomplete TSH once it had arrived on the socket.
  

Problem conclusion

• WebSphere MQ was modified to ensure that the socket processing
  layer would repeatedly issue Receive calls on the socket until
  one entire MQ message segment was present. The buffer returned
  would then contain the entire MQ message segment as opposed to
  only the first part of it. Subsequent socket calls would then
  correctly retrieve the next logical MQ message segment instead
  of the second half of a previous MQ message segment.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
                     v7.0
  Platform           Fix Pack 7.0.1.2
  --------           --------------------
  Windows            U200316
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available, information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

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:

Fix information

• Fixed component name

  MSG SRVCS CL .N

• Fixed component ID

  5724M2100

Applicable component levels

• R200 PSY

     UP