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After you enable the RPC over HTTP networking component for IIS, you may need to configure the RPC proxy server added with specific port numbers to speak with the servers their corporate net. In this scenario, the RPC proxy server is configured get a specific ports and the average person computers that the RPC proxy server communicates with likewise configured to employ a specific ports when receiving requests from the RPC proxy server. However run Exchange 2003 Setup, Exchange is automatically configured to make use of the ncacn_http ports liste