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PollingDuplexHttpBinding Client Channel Faults unexpectedly after few seconds

Posted By:      Posted Date: September 08, 2010    Points: 0   Category :WCF
 
Hello, i have a Silverlight 4 application which communicates using Http Polling Duplex to an IIS 7, .NET 4 WCF Service (actually two of them, in the same app). I am obviously taking advantage of the callback features provided by this type of solution. Setup has been performed by following these documents: Service setup: http://msdn.microsoft.com/en-us/library/cc645027%28v=VS.95%29.aspx Silverlight setup: http://msdn.microsoft.com/en-us/library/ee844557%28v=VS.95%29.aspx All has been working fine until yesterday, when i went on upgrading the Silverlight Tools for VS2010 to version 10.0.30319.352 which has also upgraded my Silverlight runtime to 4.0.50826.0 . Running my app now, after few seconds from the first call to the services, the client inner-channel faulted event fires on both proxies without an apparent motivation (exception, user interaction, etc.). What i have been able to notice, by analyzing connections with Fiddler, is that as soon as the open connection to the service which holds a callback channel receives a response, the client-side proxies fail. I'll try to show how the HTTP connections appear to behave: Call to the first service, callback channel retreived, immediate response 200 OK, no content Call to the second service, business logic performed, immediate response 200 OK, no content Call to the first service, no response for a few seconds, response 200 OK


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