A hotfix rollup is available to fix problems in Windows Communication Foundation in the .NET Framework 3.5 SP1 for Windows 7 and for Windows Server 2008 R2

This article introduces a hotfix rollup that fixes several problems in Windows Communication Foundation (WCF) on computers that are running Windows 7 or Windows Server 2008 R2. The hotfix rollup applies to the .NET Framework 3.5 Service Pack 1 (SP1). For more information about the problems that are fixed in this hotfix rollup, click the following article numbers to view each article in the Microsoft Knowledge Base:

• 971841 FIX: You experience performance issues when you run a .NET Framework 3.5-based WCF service that uses TCP transport and enables channel caching under heavy load conditions
  
  
• 971842 FIX: URIs in a WCF WSDL document refer to inaccessible internal instances instead of to the load balancer as expected in the .NET Framework 3.5
  
  
• 973606 FIX: Authentication fails when a client calls a WCF service in which a user creates a self-signed certificate for SSL authentication
  
  
• 971493 FIX: A hotfix that enables WCF to send secured messages and to receive unsecured responses, and to send unsecured messages and to receive secured responses, is available for the .NET Framework 3.5 Service Pack 1