title: Having two WCF application in the same pool cause weird problems
body: <p>I have a WCF application, running on .NET 3.5 SP1, hosted in IIS7, on a Windows Server 2008 64-bit.</p>
  
  <p>In our architecture, there is 1 instance of the application per client, DLLs are copied in a separate directory for each client. In IIS, we host 5 or so clients per application pool, each client having its own application/virtual directory/physical directory configured.</p>
  
  <p>This config works fine for our current version, which uses .NET 2.0 ASMX Webservices with WSE.</p>
  
  <p>When we put our new version using WCF in test, it worked fine when the application pool has only one application in it. When we put 2 applications in the same pool, the services starts returning null for no reason while it is not when isolated.</p>
  
  <p>Our application pool managed pipe line is "Classic", and I have also tried in "Integrated" mode, the problem is still there.</p>
  
  <p>Anyone have some ideas of what is going on ?</p>