The new MultipleMessagesPerPoll mode added to PollingDuplex in Silverlight 4, comes with some new timeouts , so I thought it would be useful to post a detailed description of how those work. Unfortunately this is not currently covered by our documentation, which is something we are looking to address in upcoming documentation refreshes.
This is a fairly advanced topic, and the default settings should work well for most customers, so only modify these if you are encountering an issue, and you are fairly confident a timeout is causing the problem. The information below applies only to the new multiple messages mode, which is activated by setting duplexMode="MultipleMessagesPerPoll" on the PollingDuplex binding or binding element.
One important thing in the text below ...
Go to the complete details ...