RE: OWA without ISA server

  • From: "Andrew English" <andrew@xxxxxxxxxxxxxxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Tue, 7 Jun 2005 08:10:10 -0400

You should be asking this question in the mailing list,
not in the Exchange one. I use RPC over HTTP on my Exchange server 2003.
I don't have any problems with it except that the odd user doesn't use
Windows XP which is required to make it work. 






From: adrian bolzan [mailto:abolzan@xxxxxxxxxxxxxxxxxxxxxxxxx] 
Sent: Tuesday, June 07, 2005 5:15 AM
To: [ExchangeList]
Subject: [exchangelist] OWA without ISA server

Hi all,


We currently run Exchange 2003 with FE and BE servers.

The FE server is in a DMZ, whilst the BE servers are located on the
Internal/protected network.

The FE servers are only accessed by staff on our WAN and selected staff
via the internet (those with permanent IP addresses).

We do not use ISA server, although it is on the horizon, rather using a
firewall appliance that performs stateful packet inspection, DOS, etc.


Currently, the FE server is part of our domain, and i have opened up all
ports between the FE server and the BE server and DC's in the protected
network, whilst restricting access from the internet to those with
permanent IP addresses on the ADSL/cable connections. If I remember
correctly, I can configure the communication between the FE server and
the DC's to be over a single port, which requires registry hacks,
although this has not been implemented. 


What are your thoughts, with respect to security, on allowing general
HTTPS access to the FE server for OWA from the internet without ISA
server and with the scenario i have painted above?





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