On WCF forums, I have noticed a common issue that developers face when hosting their WCF service in WAS. The issue is that the service does not get activated. Often, the reason is that the queue name does not match the service endpoint name. This msdn...

There are a number of factors that can affect the performance of your enterprise application that uses MSMQ with WCF. Nicholas Allen discusses some of these design decisions in his Optimizing MSMQ article. Another good reference is Best Practices for...

The MsmqIntegrationBinding allows users to create WCF applications that send and receive messages to and from existing MSMQ applications that use System.Messaging or other MSMQ APIs. The operation contract should be one-way i.e. IsOneWay = true...

Message message = new Message(); message.CorrelationId = Guid.NewGuid().ToString(); The above code snippet compiles but when you execute it, you get a System.InvalidOperationException with an ambiguous message: "Identifier is not in the incorrect format...

If your MSMQ environment has AD Integration installed, you can use PUBLIC= formatnames for public queues and PRIVATE= formatnames for private queues. PUBLIC= formatnames are pretty easy to work with: if you know the path of the queue, you can get or construct...

Creating a reliable service for MSMQ has been made simpler with the introduction of Windows Process Activation Service (WAS). Your deployment scenario may make it easier to have WAS running on a separate machine from where the MSMQ queue of interest is...

With the release of Windows Vista (and subsequently Windows Server 2008), a new way to host WCF services was introduced: Windows Process Application Service (WAS). Services that use MSMQ now have the option of being hosted in WAS . One of the most frequently...

IIS 7 allows isolation of web application pools from each other by providing the ability to run application pools as separate identities. The identity of an application pool is the name of the service account under which the application pool's worker...

I was called on to assist recently in diagnosing why an MSMQ client was unable to send messages to a queue on a server. One of the things the owner of the machines did was take a network trace on the client of the connection attempt, and what I saw there...

I have come across this question of whether JMS and MSMQ are interoperabe a number of times and so I decided to address it. Microsoft does not have a JMS provider for MSMQ so basically you will need to use a third party product or implement your own JMS...

Windows Communication Foundation (WCF) provides a powerful programming model to develop service-oriented applications. MSMQ integrates very well with WCF so queued applications can be developed using WCF. WCF provides two bindings that support MSMQ -...

Windows Server 2008 R2 introduces a new feature in Active Directory, the Active Directory Recycle Bin. When MSMQ is installed on a domain-joined machine with the MSMQ directory integration feature installed, it makes use of Active Directory objects, particularly...

There are a few different ways of getting a count of the number of messages in the MessageQueue. Here’s a simple one. public static int GetMessageCount( MessageQueue q) { int messageCount = 0; using ( MessageEnumerator messageEnumerator...

Patrick Toolis of the MSMQ test team has written a great whitepaper on using LINQ (Language-Integrated Query) with MSMQ via system.messaging. It's twelve pages long with a number of screenshots and diagrams, so I'm not going to try to post it directly...

MSMQ has supported receiving messages from queues hosted on other machines ("remote receive") since the beginning. However, remote receives within a transaction have not been supported. That's a significant detail, and has generated a lot of customer...

Hello and welcome back from the holidays! I will get around to describing how to use acknowledgements and deadlettering soon, but right now, those of you who are already using acknowledgements should know that there is a slight behavior change coming...

MSMQ provides several sets of performance counters which query the state of the service and other objects (sessions, queues, etc.) and can be used in various monitoring systems. There are a few KB articles and blog entries explaining things you need to...

Timeouts, acknowledgements, and deadlettering, working together, will help you deal with not just the situation where a remote queue doesn't exist, but all the other things which could go wrong along a message's way from sender to destination. MSMQ...

There are a few differences in MSMQ and IIS functionality between Windows Server 2003 (MSMQ v3.0) and Windows Server 2008 (MSMQ v4.0). This means that there are a few configuration changes you may have to make to your MSMQ system post-upgrade to make...

It's a holiday weekend here. Happy Thanksgiving to all our US readers! Tune in next week for another exciting adventure.

Justin is out of the country and I'm on the far side of the continent, so we're experiencing a small break in our posting schedule. For now, a quick tip: MSMQ is a transport. It supports a few mechanisms for scanning through the messages in a queue...

One of the basic principles of MSMQ's design is that sender and receiver are decoupled. The sending application does not need to know whether the receiving application is running or even reachable under current network conditions: it can just send, and...

A very user friendly administrator UI tool for creating, configuring and managing MSMQ Clusters While this isn’t really a new MSMQ clustering feature, it’s worth being mentioned first. If you have used Win2k3 Cluster’s Cluster Admin UI, you will find...

TechEd Developers 2007 is just a couple days away now and we're getting really excited to hear what you have to say. If you use MSMQ, System.Messaging, or WCF Queues, please be sure to stop by our Ask the Experts booth so we can see what's on your mind...

Internally, MSMQ uses the Windows-provided CryptoAPI to do all of its encryption and hashing. Starting with Windows NT 4.0 Service Pack 2, CryptoAPI had a bug in its implementation of RC2 encryption in the enhanced (128-bit) provider: the keys were generated...