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    <p>WCF services can cope with a huge number of calls but, to avoid denial of service attacks, the number of requests that can be processed is limited by default.</p> <p>The significant limitations for Silverlight WCF services would be </p> <ul> <li>A default limit of 2 simultaneous calls from the same IP address.</li> <li>A limit of approx 10-16 concurrent connections (documentation varies on this one).</li> </ul> <p>This CodeProject article on <a href="http://www.codeproject.com/Articles/133738/Quick-Ways-to-Boost-Performance-and-Scalability-of" rel="nofollow noreferrer">Quick Ways to Boost Performance and Scalability of ASP.NET, WCF and Desktop Clients</a> was useful.</p> <p>I am guessing you are immediately hitting the first issue. In your WCF config you need to add the following to increase the single IP connections:</p> <pre><code>&lt;system.net&gt; &lt;connectionManagement&gt; &lt;add address="*" maxconnection="100" /&gt; &lt;/connectionManagement&gt; &lt;/system.net&gt; </code></pre> <p>You may then hit the second limit for which the solution is tweak the service behaviors in the web/app.config files.</p> <p>Here are a few more references I found while sorting out these issues myself:</p> <ul> <li><a href="http://weblogs.asp.net/paolopia/archive/2008/03/23/wcf-configuration-default-limits-concurrency-and-scalability.aspx" rel="nofollow noreferrer">http://weblogs.asp.net/paolopia/archive/2008/03/23/wcf-configuration-default-limits-concurrency-and-scalability.aspx</a></li> <li><a href="https://stackoverflow.com/questions/686466/why-does-wcf-limit-concurrent-connections-to-5">Why does WCF limit concurrent connections to 5?</a></li> <li><a href="http://msdn.microsoft.com/en-us/magazine/cc163590.aspx#S10" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/magazine/cc163590.aspx#S10</a></li> <li><a href="http://blogs.msdn.com/b/stcheng/archive/2009/01/06/wcf-things-that-will-impact-concurrency-capacity-behavior-of-wcf-service-with-simoultaneous-client-requests-connections.aspx" rel="nofollow noreferrer">http://blogs.msdn.com/b/stcheng/archive/2009/01/06/wcf-things-that-will-impact-concurrency-capacity-behavior-of-wcf-service-with-simoultaneous-client-requests-connections.aspx</a></li> <li><a href="http://www.codeproject.com/Articles/133738/Quick-Ways-to-Boost-Performance-and-Scalability-of" rel="nofollow noreferrer">http://www.codeproject.com/Articles/133738/Quick-Ways-to-Boost-Performance-and-Scalability-of</a></li> <li><a href="http://www.danrigsby.com/blog/index.php/2008/02/20/how-to-throttle-a-wcf-service-help-prevent-dos-attacks-and-maintain-wcf-scalability/" rel="nofollow noreferrer">http://www.danrigsby.com/blog/index.php/2008/02/20/how-to-throttle-a-wcf-service-help-prevent-dos-attacks-and-maintain-wcf-scalability/</a> </li> <li><a href="http://msdn.microsoft.com/en-us/library/7w2sway1%28v=vs.71%29.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/7w2sway1%28v=vs.71%29.aspx</a></li> <li><a href="http://www.codeproject.com/Articles/89858/WCF-Concurrency-Single-Multiple-and-Reentrant-and" rel="nofollow noreferrer">http://www.codeproject.com/Articles/89858/WCF-Concurrency-Single-Multiple-and-Reentrant-and</a></li> <li><a href="https://stackoverflow.com/questions/739312/c-sharp-wcf-wcf-stops-responding-after-about-10-or-so-calls-throttling">WCF stops responding after about 10 or so calls (throttling)</a></li> </ul>
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    1. COIncreasing the max connections has stopped the timeouts which is great, I'll have to give those articles a read and see if there are any other tricks I can use. Thanks
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