title: too busy error in my wcf service
body: <p>I create a webservice in wcf ,with these config :</p>
  
  <pre><code>&lt;?xml version="1.0"?&gt;
  &lt;configuration&gt;
  
    &lt;appSettings&gt;
      &lt;add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" /&gt;
    &lt;/appSettings&gt;
    &lt;system.web&gt;
      &lt;compilation debug="true" targetFramework="4.5.2" /&gt;
      &lt;httpRuntime targetFramework="4.5.2"/&gt;
      &lt;authentication mode="None" /&gt;
    &lt;/system.web&gt;
    &lt;system.serviceModel&gt;
      &lt;behaviors&gt;
        &lt;serviceBehaviors&gt;
          &lt;behavior&gt;
            &lt;serviceMetadata httpGetEnabled="true" httpsGetEnabled="true" /&gt;
            &lt;serviceDebug includeExceptionDetailInFaults="false" /&gt;
          &lt;/behavior&gt;
        &lt;/serviceBehaviors&gt;
        &lt;endpointBehaviors&gt;
          &lt;behavior name="web"&gt;
            &lt;webHttp/&gt;
          &lt;/behavior&gt;
        &lt;/endpointBehaviors&gt;
      &lt;/behaviors&gt;
  
      &lt;services&gt;
  
        &lt;service name="lpz.Application.ServiceImplement.InquiryService" &gt;
          &lt;endpoint address=""
                    binding="webHttpBinding"
                    contract="lpz.Domain.Service.IInquiryService"
                    behaviorConfiguration="web"/&gt;
  
        &lt;/service&gt;
      &lt;/services&gt;
  
      &lt;protocolMapping&gt;
        &lt;!--&lt;add binding="basicHttpsBinding" scheme="https" /&gt;--&gt;
        &lt;add binding="webHttpBinding" scheme="https"/&gt;
  
      &lt;/protocolMapping&gt;
      &lt;serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" /&gt;
    &lt;/system.serviceModel&gt;
    &lt;system.webServer&gt;
      &lt;httpProtocol&gt;
        &lt;customHeaders&gt;
          &lt;add name="Access-Control-Allow-Methods" value="GET, POST,PUT,DELETE" /&gt;
        &lt;/customHeaders&gt;
      &lt;/httpProtocol&gt;
      &lt;modules runAllManagedModulesForAllRequests="true"/&gt;
  
      &lt;directoryBrowse enabled="true"/&gt;
    &lt;/system.webServer&gt;
  
  &lt;/configuration&gt;
  </code></pre>
  
  <p>I decided to test my service using j_meter ,a simulator for create request ,so i create a fake request to call my service with 20 thread .so i did that ,but my service working for 4 minute and after that i get this page :
  <a href="https://i.stack.imgur.com/FPTB7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/FPTB7.png" alt="enter image description here"></a> and after 4 minutes it works again and this process is repeated.why ?</p>