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copied!<p>I ran into this problem this week and I wasn't able to quite figure out what was going on. I actually did change my call to my service to <code>Dispose()</code> the service client, but it didn't seem to have any effect. Apparently, there was another service call lurking somewhere.</p> <p>What may be interesting to note is what made me decide that this was <em>not</em> the problem: this limit is not related to the actual number of socket connections to the webservice. When you hit the <code>maxConcurrentSessions</code> limit, there is still only <strong>one actual socket connection</strong>. I was checking this with <code>netstat</code>, which brought me to the wrong conclusion. So, <strong>don't confuse sessions with sockets</strong>.</p> <p>We have interfaces defined for all our WCF services, so I'm planning to adapt this pattern in my code now:</p> <pre><code>IMyService service = new MyServiceClient(); using (service as IDisposable) { service.MyServiceMethod(); } </code></pre> <p>What's also interesting, is that the problem did not occur for me when the services (and website) were hosted on IIS. The configuration is (almost) identical, yet I could not reproduce this behavior on that machine. I guess that's a good thing :)</p> <h2>@ John Saunders (about variable assignment in <code>using</code>):</h2> <p>I usually do put the variable assignment in the <code>using</code> statement. But the IMyService that's generated is not implicitly convertible to <code>IDisposable</code>. If you really wanted the assignment in there, I suppose the alternative would be:</p> <pre><code>IService service; using ((service = new ServiceClient()) as IDisposable) { } </code></pre> <p>That still leaves the problem of the variable scope being wrong though. The reference to <code>IService service</code> is unusable, but still in scope. So this would be better in that respect:</p> <pre><code>using (IDisposable serviceDisposable = new ServiceClient()) { IService service = (IService)serviceDisposable; } </code></pre> <p>That requires me to introduce an extra variable name though. <strong>*Meh*</strong></p>

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