Exchange server Proxy address when configuring outlook

[GOSCO]

Is the purpose of an exchange server proxy address to ensure the exchange server ip address cannot be resolved unless authenticated?

Are there any other reasons?

 

[58sniper]

No. You would be able to determine the IP of an Exchange server via simple DNS.

Pat Richard MVP
Plan for performance, and capacity takes care of itself. Plan for capacity, and suffer poor performance.

http://www.exchangeblogs.com/

 

[GOSCO]

Ok I found this explanation on the web:

Principles of RPC over HTTP Proxy RPC over HTTP Proxy Exchange 2003 new feature

Back to basics. RPC means remote procedure call and while this technology has been around a long time, there is a new twist in Exchange 2003. Let me explain; in this context RPC means that Outlook 2003 can remotely connect to Exchange and open its mailbox on the server. What's new is the ability to encapsulate these RPC commands in HTTP.

The killer advantage of RPC over HTTP is that you only have to open up port 443 (or 80) on the outer firewall. With earlier versions of Outlook and Exchange you would also need to open port 135 and possibly port 53. These are two ports that hackers love to attack. To get the best out of this arrangement have an ISA server in the perimeter network, and configure it to connect to a front-end server inside the second firewall.

What makes RPC over HTTP even more secure, is that by default, Outlook 2003 clients connect to the server using SSL.