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    <p>What I believe is happening here is that your channel is timing out (as you suspect).</p> <p>If I understand correctly, it is not the calls to service <strong>A</strong> that are timing out, but rather to service <strong>B</strong>, <em>before</em> you call your operation.</p> <p>I'm guessing that you are creating your channel <em>before</em> you call service <strong>A</strong>, rather than <em>just in time</em> (i.e. before calling service <strong>B</strong>). You should create the channel (proxy, service client) just before you use it like:</p> <pre><code>AResponse aResp = null; BResponse bResp = null; using (ServiceAProxy proxyA = new ServiceAProxy()) { aResp = proxyA.DoServiceAWork(); using (ServiceBProxy proxyB = new ServiceBProxy()) { bResp = proxyB.DoOtherork(aResp); } } return bResp; </code></pre> <p>I believe however, that once you get over <em>that</em> problem (service B timing out), you'll realize that the sharepoint app's proxy (that called service <strong>A</strong>) will timeout. To solve that, you may wish to change your service model from a request-response, to a publish-subscribe model.</p> <p>With long-running services, you'll want your sharepoint app to subscribe to service A, and have service A publish its results when it is ready to do so - regardless of how long it takes.</p> <p>Programming WCF Services (O'Reilly) by Juval Lowey, has a great explanation, and IDesign (Juval's company) published <a href="http://idesign.net/idesign/download/IDesign%20WCF%20Coding%20Standard.zip" rel="nofollow noreferrer">a great set of coding standards for WCF</a>, as well as the code for a great <a href="http://idesign.net/idesign/DesktopDefault.aspx?tabindex=-1&amp;tabid=19&amp;download=225" rel="nofollow noreferrer">Publish-Subscribe Framework</a>.</p> <p>Hope this helps, Assaf.</p>
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