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KB Article: http://support.microsoft.com/kb/2579729
Assume that you apply IPsec policies on a computer that is running Windows 7 or Windows Server 2008 R2 and that is located behind hardware load balancing (HLB) equipment in a network environment. In this situation, you may be unable to access a website that is hosted on the computer until the timer for the security association (SA) expires.Note HLB equipment behaves like a proxy server for client traffic to the computer. Therefore, the computer may believe all traffic is coming from the same source address.