68 Barracuda SSL VPN Administrator’s Guide
Microsoft Exchange 2003 RPC/HTTPS
By using Outlook with RPC/ HTTPS mode enabled this allows you to connect to your Exchange
server from an Outlook 2003 client in native mode using the Barracuda SSL VPN as a pass through
proxy. Unlike POP/SMTP, this means that all mail is held centrally rather than being downloaded to
each client.
This feature provides a pass-thru proxy for Outlook RPC over HTTPS traffic. It is in no way a
replacement for a front-end HTTPS server in a normal Exchange HTTPS topology, but is instead a
facility to allow the Barracuda SSL VPN to become the Internet facing proxy for your Outlook users.
This allows your Outlook clients and Exchange server to communicate over a single open port on the
organization firewall.
Being part of the security framework provided by the Barracuda SSL VPN, your Exchange users
benefit from the policy based security provided and access to this service is provided by way of
authorized policies.
RPC/HTTPS
RPC over HTTP allows Microsoft Outlook clients to access Microsoft Exchange server over the
internet. The MAPI protocol usually uses RPC to make calls to the Exchange server using TCP, but
here we are able to tunnel Outlook RPC requests inside an HTTP session.
The RPC over HTTP Proxy networking component extracts the RPC requests from the HTTP request
and forwards the RPC requests to the appropriate server. The advantage of this approach is that only
the RPC proxy server has to allow access from the Internet. Back-end Exchange servers do not have
to allow access from the Internet.
Configuration
Configuration is broken into two parts, the server and the client. This document assumes that the
Exchange administrator has already configured the Exchange server to accept RPC calls over HTTP.
For further information on how to configure this please refer to the Microsoft Web site.
This chapter however does detail how to configure a new mail account to use your appliance as a
proxy to communicate with the configured RPC/HTTPS Exchange server.
Summary of Contents for SSL VPN
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