MessageQueueException in ReadHandle

[Andrew Hayes]

Hi All

I've got some code that enumerates the public message queues on various remote servers and I've run into a snag..

First, here's a code snippet that is mostly working

MessageQueue[] qList = MessageQueue.GetPublicQueuesByMachine( mName )

foreach(MessageQueue queueItem in qList

tr

queueItem.Formatter = new BinaryMessageFormatter()

queueItem.MessageReadPropertyFilter.SetAll()

MessageEnumerator myEnumerator = queueItem.GetMessageEnumerator()

while(myEnumerator.MoveNext()

tr

mMessageCount++

catch (Exception exp

MessageBox.Show( exp.Message, "Error Getting Message" )

catch (Exception exp

MessageBox.Show( exp.Message, "Error Getting Queue" )
MessageBox.Show( queueItem.Path + ":" + mMessageCount, "Message Count for Queue" )
OK. For most of the servers this works great... Except for 1. It's a newly installed Windows 2003 Server and the myEnumerator.MoveNext() call throws a MessageQueueException with no message text..

Well, I say that but the _message element says "External component has thrown an exception." and _stackTraceString shows

at System.Messaging.MQCacheableInfo.get_ReadHandle(
at System.Messaging.MessageEnumerator.get_CursorHandl e(
at System.Messaging.MessageEnumerator.MoveNext(TimeSp an timeout
at System.Messaging.MessageEnumerator.MoveNext(
at QueueMonitor.EnumerateQueues() in c:\projects\queuemonitor\queuemonitor.cs:line 5

So, I put in a breakpoint on the queueItem.Formatter line and hit Shift+F9 to QuickWatch queueItem... That's when I noticed

ReadHandle <error: an exception of type: {System.Messaging.MessageQueueException} occurred

I step through to after the myEnumerator construction and take a look at that

Handle
Current <error: an exception of type: {System.InvalidOperationException} occurred
CursorHandle <error: an exception of type: {System.Messaging.MessageQueueException} occurred

Seems I can't get the Handle for the Message Queue, which in turn means I can't get a Handle for the Enumerator... So I checked the security on the remote public queue I was enumerating and ( like everyone else on these NG's seems to do ) it was set to Everyone - Full Control... My machine and the remote machine both belong to the same Active Directory domain, and DNS is correctly setup for that to work... I believe..

Looking at the Exception instance I also see

_COMPlusExceptionCode -53245969
_HResult -214746725
MessageQueueErrorCode -214702307

Searching for 0x80070721 (-2147023071) seems to indicate it's a DCOM Automation error to do with security packages, so maybe there is something extra I need to do in 2K3 to allow me to enumerate the messages in the public queues..

Anyone have any thoughts, comments, ideas, suggestions or, preferably, solutions?

[Yoel Arnon [MSFT]]

Hi Andrew,
There seems to be some kind of authentication problem between your
Windows2003 server and the domain controller. The problem occurs in the
Active Directory access layer "under" MSMQ.

I would check the following:
1. Can you see the queues when running Active Directory Users and Computers
from the Windows 2003 box?
2. Does your program run as a service / ASP / COM+ component / Cluster
resource orany other special security context?
3. When you installed MSMQ, did it ask you for a DS server? (If it did, it
cannot locate the Active Directory through DNS, and it uses the old MSMQ 1.0
/ 2.0 interface)
4. Is your DNS configured right? (simple test: ping your DC using its short
netbioos name, and see if ping says "pinging <netbios name>" or "pinging
<full DNS name>. The former usually means that DNS is not configured right.

HTH,
Yoel
---
This posting is provided "AS IS" with no warranties, and confers no rights.

"Andrew Hayes" <an*******@discussions.microsoft.com> wrote in message
news:6E**********************************@microsof t.com...

Hi All,

I've got some code that enumerates the public message queues on various remote servers and I've run into a snag...
First, here's a code snippet that is mostly working:

MessageQueue[] qList = MessageQueue.GetPublicQueuesByMachine( mName );

foreach(MessageQueue queueItem in qList)
{
try
{
queueItem.Formatter = new BinaryMessageFormatter();

queueItem.MessageReadPropertyFilter.SetAll();

MessageEnumerator myEnumerator = queueItem.GetMessageEnumerator();

while(myEnumerator.MoveNext())
{
try
{
mMessageCount++;
}
catch (Exception exp)
{
MessageBox.Show( exp.Message, "Error Getting Message" );
}
}
}
catch (Exception exp)
{
MessageBox.Show( exp.Message, "Error Getting Queue" );
}

MessageBox.Show( queueItem.Path + ":" + mMessageCount, "Message Count for Queue" ); }

OK. For most of the servers this works great... Except for 1. It's a newly installed Windows 2003 Server and the myEnumerator.MoveNext() call throws a
MessageQueueException with no message text...
Well, I say that but the _message element says "External component has thrown an exception." and _stackTraceString shows:
at System.Messaging.MQCacheableInfo.get_ReadHandle()
at System.Messaging.MessageEnumerator.get_CursorHandl e()
at System.Messaging.MessageEnumerator.MoveNext(TimeSp an timeout)
at System.Messaging.MessageEnumerator.MoveNext()
at QueueMonitor.EnumerateQueues() in c:\projects\queuemonitor\queuemonitor.cs:line 59
So, I put in a breakpoint on the queueItem.Formatter line and hit Shift+F9 to QuickWatch queueItem... That's when I noticed:
ReadHandle <error: an exception of type: {System.Messaging.MessageQueueException} occurred>
I step through to after the myEnumerator construction and take a look at that:
Handle 0
Current <error: an exception of type: {System.InvalidOperationException} occurred> CursorHandle <error: an exception of type: {System.Messaging.MessageQueueException} occurred>
Seems I can't get the Handle for the Message Queue, which in turn means I can't get a Handle for the Enumerator... So I checked the security on the
remote public queue I was enumerating and ( like everyone else on these NG's
seems to do ) it was set to Everyone - Full Control... My machine and the
remote machine both belong to the same Active Directory domain, and DNS is
correctly setup for that to work... I believe...
Looking at the Exception instance I also see:

_COMPlusExceptionCode -532459699
_HResult -2147467259
MessageQueueErrorCode -2147023071

Searching for 0x80070721 (-2147023071) seems to indicate it's a DCOM Automation error to do with security packages, so maybe there is something
extra I need to do in 2K3 to allow me to enumerate the messages in the
public queues...
Anyone have any thoughts, comments, ideas, suggestions or, preferably,

solutions?