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When an MQ .Net client application connects to a queue manager
wherein an IP address is specified in the connection
properties of the channel, the following error is reported:
MQRC_HOST_NOT_AVAILABLE error and the SocketException
(0x80004005)
Traces show the following stack:
[Date/Time] 00000006 X UOW= source=IBM.WMQ.MQTCPConnection
org=IBM prod=WebSphere component=Message Service Client for .NET
thread=[1 : 0]
System.Net.Sockets.SocketException (0x80004005): No such host is
known
at System.Net.Dns.InternalGetHostByAddress(IPAddress address,
Boolean includeIPv6)
at System.Net.Dns.GetHostEntry(String hostNameOrAddress)
at IBM.WMQ.MQTCPConnection.ConnectSocket(String localAddr,
String connectionName, Int32 options)
This is caused by the new behaviour of Dns.GetHostEntry().
Microsoft .NET 4.0 Framework has become stricter in its
validation while parsing the IP address to improve security.
This problem only occurs when using an IP address rather than
hostname for the connection properties of the channel.
Additional keywords:
Reason 2538
Local fix
Replace the IP address with host-name in the CONNAME parameter.
Create/modify your local hosts file on Windows and add your IP
address with host-name, if you need to use an IP address.
Problem summary
****************************************************************
USERS AFFECTED:
WebSphere MQ .NET application users using .NET framework 3.5 and
above
Platforms affected:
Windows
****************************************************************
PROBLEM SUMMARY:
MQ .NET applications that use framework 3.5 or higher may fail
with MQRC_HOST_NOT_AVAILABLE error while connecting to MQ
queue manager which runs on a server that is behind firewall.
The Dns.GetHostEntry() method invoked by the MQ .NET code to
resolve the host name or IP address of the server to an
IPHostEntry instance fails with the below error
System.Net.Sockets.SocketException (0x80004005).
The implementation of the Dns.GetHostEntry() has been changed
since the .Net framework 3.5 and the latest code fails to
resolve the host name if the server is behind a firewall. It
is noticed that application works if it is compiled with .Net
framework 2.0.
Problem conclusion
The MQ .NET code is modified to invoke Dns.GetHostEntry() method
in place of Dns.GetHostAddresses() to fix this problem.
---------------------------------------------------------------
The fix is targeted for delivery in the following PTFs:
Version Maintenance Level
v7.0 7.0.1.13
v7.1 7.1.0.5
v7.5 7.5.0.4
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
IC97627
Reported component name
WMQ WINDOWS V7
Reported component ID
5724H7220
Reported release
701
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2013-11-13
Closed date
2014-01-29
Last modified date
2014-01-29
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fixed component name
WMQ WINDOWS V7
Fixed component ID
5724H7220
Applicable component levels
R701 PSY
UP
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