Exchange remote access by using Outlook 2003 (RPC-HTTP)

[Guest]

I have setup Exchange 2003 Ent Edition in Frontend-Backend configuration.
Between servers i have enable RPC-HTTP, i.e. RPC-HTTP Frontend server and
RPC-HTTP Backend server. I have connected using OWA and it was working fine.
And I can access the Exchange backend server through the Frontend server when
connecting from outside using a dialup using OWA (Web).
Then i have configured a Win XP client (Win XP SP2) with Outlook 2003 (SP2)
to access the backend exchange server. I have made all the configurations in
the outlook profile (HTTP Access settings/SSL) but i'm unable to connect. it
gives the following error message " ! Task 'Microsoft Exchnage Server'
reported error(0x8004010F):'The operation failed. An object could not be
found'

Please not: I'm trying to connect using a PC which is located in the same
subnet as the Exchange Frontend server (DMZ). I have created the exchange
profile locally (Local RPC) at the first time and tried accessing from the
DMZ network via the Forntend server.

 

[Guest]

And the following error also appeared
!Task 'Microsoft Exchange Serer - Sending reported error (0x80040115):'The
connection to the Microsoft Exchange Server is unavailable. Outlook must be
online or connected to complete this action.'