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I have a non transactional Message Queue on a windows server 2008 (data center edition) with 31 clients. The connecting servers are not within the same workgroup or domain (don't know if that plays a role).

The problem is, that the queue only receives messages from some clients (9 actually) and the messages of the other clients are lost.

I can't find any error message in the windows event log. The MSMQ state on the clients says "connected" and the dead letter queues are empty... If I stop the MSMQ Service on the Server, the messages get correctly queued up on the client machines.

What other possible reasons for the loss of the messages should I look for? Can this behaviour be caused by any component inbetween?

Scenario

Each server (MSMQ client - there are 31) sends on every full minute a message to the MSMQ Server (message size about 40k Bytes). If I enable journaling I only see the messages from nine (instead of 31) servers on the MSMQ server, the other messages are lost. The messsages that are received are always from the same servers.

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Licences won't cause message loss. If licencing was a blocker, you would have clients without a CAL being unable to connect and messages remaining in their outgoing queue. Messages disappear either because they have been read or their TTRQ/TTBR timers have expired. There will be no events in the Windows event log. You need to use journaling to track what happens to the messages.

  • Thanks, I tried journaling: I see only the messages from 10 Clients in the journal queue. That's the reason why I think that the messages get lost before they are read by the application. – Jeldrik Jan 26 '15 at 8:08
  • OK, so you know they are not reaching the queue. Try positive and negative source journaling to track them in flight. – John Breakwell Jan 26 '15 at 11:34
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    Thanks, John. It seems that the reason is that the servers are all clones: blogs.msdn.com/b/johnbreakwell/archive/2007/02/06/…. But at the moment we'are still verifying this. – Jeldrik Jan 26 '15 at 14:11
  • Wow - is it really 8 years since I wrote that blog post? – John Breakwell Jan 26 '15 at 17:21
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    Now I see, it was your blog post! I really must thank you that you did write it. I almost did fall into despair. – Jeldrik Jan 26 '15 at 19:37

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