FIX: Forefront Threat Management Gateway 2010 prematurely closes the connection to the web server when a web proxy client uploads data by using an SSL tunnel

KB Article:


Consider the following scenario:

  • A web proxy client establishes a secure socket layer (SSL) connection to an external web server by using a server that is running Microsoft Forefront Threat Management Gateway 2010.
  • HTTPS inspection is not involved. Therefore, an end-to-end SSL tunnel between the client and the web server is established.
  • Inside this established connection, the client uploads data to the web server.
  • The connection and TCP flow to the web server are slow.

In this scenario, the upload does not finish correctly under certain circumstances.

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