Wcf Tcp duplex service unreachable -

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i create wcf service using net.tcp binding , put in server , going right( can browse it, call , getting answer etc..

i implemented heartbeat method in service called application.

after while (half day or may more) when try reach service : "a connection attempt failed because connected party did not respond after period of time, or established connection failed because connected host has failed respond"

what weird old client (just one) still connected service , work cannot call wcf service other clients

i activated wcf tracing there no errors.

when recycle apppool service start working , after while same weird behaviour..

any idea or solution please? start working on issue week ago , untill no progress


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