title: WCF connections close very slowly with SSL
body: <p>We have WCF services that operate over multiple protocols for different customers. Most work fine, but when we use SSL the connections take a long time to close. Opening a connection is no problem, but closing is very slow.</p>
  
  <p>The strangest behavior is that the close time is proportional to the amount of data that was transmitted on the connection. If just a few bytes are sent from the server to the client the connection will close almost instantly, but a search that returns several hundred rows takes as long to close the connection as the original search. The close time seems directly proportional to amount of data transmitted. It seems that the results are retransmitted back to the server for verification before the connection will close.</p>
  
  <p>An error is almost never thrown, but the connection close time essentially doubles the required time to execute a call.</p>
  
  <p>Here are the basic settings:
  Custom binding
  Binary encoding
  Reliable session, Ordered=true
  Binding element is HttpsTransportBindingElement
  using RemoteCertificateValidationCallback</p>
  
  <p>All of the proxies are constructed programmatically with ChannelFactory.</p>