APAR status
Closed as program error.
Error description
Description: SSL connections using the IBM MQ .NET client libraries fail intermittently during large message transfer with 2195 MQRC_UNEXPECTED_ERROR during an MQPUT. In a trace, the following text appears: System.IO.IOException: Unable to write data to the transport connection: A non-blocking socket operation could not be completed immediately. ---> System.Net.Sockets.SocketException: A non-blocking socket operation could not be completed immediately at System.Net.Sockets.Socket.Send(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags) at System.Net.Sockets.NetworkStream.Write(Byte[] buffer, Int32 offset, Int32 size) --- End of inner exception stack trace --- at System.Net.Sockets.NetworkStream.Write(Byte[] buffer, Int32 offset, Int32 size) at System.Net.Security._SslStream.StartWriting(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest) at System.Net.Security._SslStream.ProcessWrite(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslStream.Write(Byte[] buffer, Int32 offset, Int32 count) at IBM.WMQ.Nmqi.MQEncryptedSocket.Write(Byte[] buffer, Int32 offset, Int32 length)
Local fix
Problem summary
**************************************************************** USERS AFFECTED: IBM MQ .NET Client applications using SSL connections Platforms affected: Windows **************************************************************** PROBLEM DESCRIPTION: The MQ .NET classes failed to correctly handle a SocketException with error code 10035 (WSAEWOULDBLOCK) being returned from the .NET runtime. This failure to handle the error condition could result in an incomplete sequence of bytes being written over the secure socket. This invalid transmission caused the transport layer to request a reset of the connection, which the client reports as a 2195 MQRC_UNEXPECTED_ERROR. If running directly from MS Visual Studio, the following exceptions also appear (among others) in the debug output: A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll A first chance exception of type 'System.IO.IOException' occurred in System.dll A first chance exception of type 'System.IO.IOException' occurred in System.dll A first chance exception of type 'System.IO.IOException' occurred in amqmdnet.dll A first chance exception of type 'IBM.WMQ.Nmqi.NmqiException' occurred in amqmdnet.dll
Problem conclusion
The MQ .NET classes have been updated to correctly handle the WSAEWOULDBLOCK error code from the .NET runtime when writing data to a secure socket. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v8.0 8.0.0.6 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 number
IT14958
Reported component name
WMQ BASE MULTIP
Reported component ID
5724H7251
Reported release
800
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-04-26
Closed date
2016-06-03
Last modified date
2017-06-01
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
WMQ BASE MULTIP
Fixed component ID
5724H7251
Applicable component levels
R800 PSY
UP
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Document Information
Modified date:
01 June 2017