Remote Procedure Calls in a Perimeter Network

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If you decide to situate your Exchange front-end servers in a perimeter network, be aware that remote procedure calls (RPCs) are used to access Active Directory.

Note

It is recommended that you use an advanced firewall server (such as ISA Server) instead of the front-end server in the perimeter network. For more information, see Advanced Firewall in a Perimeter Network.

Remote Procedure Calls are used by Internet Information Services (IIS) to authenticate clients on the front-end server.