When Should Reliable Messaging be Used?

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You should consider using reliable messaging if the Web service is experiencing the following types of problems:

• Communication failures are occurring that result in the network being unavailable or connections being dropped
• Application messages are being lost in transit
• Application messages are arriving at their destination out-of-order and ordered delivery is a requirement

To decide whether or not to used reliable messaging, weigh the following advantages and disadvantages:

• Enabling reliable messaging ensures that messages are delivered exactly once from the source to the destination and, if the ordered-delivery option is enabled, ensures that messages are delivered in order.
• Enabling reliable messaging causes a degradation of Web service performance, especially if the ordered delivery option is enabled.
• Non-reliable messaging clients cannot interoperate withWeb services that have reliable messaging enabled.
• Non-reliable messaging clients cannot interoperate with WCF Web services that have reliable sessions enabled.