WCF services that are hosted by NLB computers to route messages to Exchange Server fail when WebHeader settings are added by using a .NET Framework 3.5 SP1 application

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Consider the following scenario:

  • You use Network Load Balancing (NLB) to route messages for a set of computers that host Windows Communication Foundation (WCF) services.
  • The services use secure sessions by setting the authenticationMode attribute to SecureConversation to communicate with Microsoft Exchange Server.
  • You add WebHeader settings to messages in the application layer by using a Microsoft .NET Framework 3.5 SP1 application. After you do this, NLB should use the WebHeader settings to route messages.

In this scenario, WebHeader settings are not added to messages that are used to negotiate the session. Therefore, messages are routed to different host computers. In this situation, any cached session data in the host computer is unavailable, and the WCF services fail.


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