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How can I
configure Internet Security and
Acceleration Server to publish OWA on an
Internal Exchange Server?
The ISA
Server allows for traditional mail
server protocols (SMTP, POP3, IMAP4, and
so on) to be published easily under the
Server Publishing Rules node. However,
no ISA Server wizard automates
publishing an internal mail server that
allows mail retrieval by using the
Hypertext Transfer Protocol (HTTP).
This
article assumes that the following
prerequisites are in effect:
-
You
are running ISA Server in firewall
mode and there are at least two
network interfaces.
-
Outlook Web Access (OWA) for
Exchange Server 5.5 or Exchange 2000
Server is accepting HTTP requests
within the internal network.
To
configure ISA Server to allow external
clients to access the internal OWA
server, perform the following four
steps:
-
Enable
an HTTP listener on ISA Server:
-
In
the ISA Management console,
expand Servers and Arrays,
right-click the ISA Server, and
then click Properties.
-
Click the Incoming Web Requests
tab, and then click Configure
listeners individually per IP
address.
-
Click Add, and click the ISA
Server name in the list box in
the Add/Edit Listeners dialog
box. Enter the IP address that
is assigned to one of the
external network interface cards
(NICs).
-
Click OK to close the dialog
box, and then click OK again to
save changes.
-
Create
a destination set that can point the
Web clients to the appropriate
folders that are used by the OWA Web
site:
-
Open the ISA Management console,
expand the ISA Server-based
server, and then click the
Policy Elements section.
-
Expand the Policy Elements
section, right-click the
Destination Set folder, click
New, and then click Set. You are
prompted to name the new
destination set; name the new
destination set "OWA".
-
In
the Destination box, enter the
Uniform Resource Locator (URL)
that the external Web clients
use to access OWA. This URL
resolves the Internet Domain
Name System (DNS) name to the
external IP address on the ISA
Server-based server.
Note:
Do not include the "http://" or
the "https://" portion of the
URL in the Destination box.
-
In
the Path box, type: /exchange*,
and then click OK.
-
Repeat step d for the Exchweb
and Public folders, adding the
path for each as /exchweb* and
/public* respectively.
-
Create
a Web Publishing Rule:
-
Expand the ISA Server to the
Publishing heading.
-
Under Publishing, right-click
Web Publishing Rules, click New,
and then click Rule.
-
Give a descriptive name to this
rule, and then click Next.
-
Apply the rule to the specified
destination set that you created
in step 2, and then click Next.
-
Click Next to accept Any
Request.
-
Click Redirect the request to
this Internal Web Server, and
then enter the IP address of the
internal server.
-
Click to select the Send the
original host header check box,
click Next, and then click
Finish.
-
Open the Services Microsoft
Management Console, and then
right-click the ISA Server
Control. Click Restart, and then
click Yes to restart all
dependent services.
-
Repeat
Steps 1 to 3 for any additional
hosted domains. Each additional
hosted domain that corresponds to a
different internal Exchange Server
should be registered on a different
IP address on the external NIC of
the ISA Server.
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