17, choose
whether there will be SSL from the ISA server to the OWA server. Because end-to-end
SSL is recommended, it is preferred to select the first option, to use SSL. Click Next
to continue.
7. Enter the Fully Qualified Domain Name (FQDN) of the OWA server on the next
dialog box. This should match the external name referenced by the client (for
example, mail.companyabc.com). Click Next to continue.
CAUTION
For an SSL-based OWA rule to work, the FQDN entered in this dialog box must exactly
match what the clients will be entering into their web browsers. If it does not match,
the host header for the SSL traffic from the ISA server to the Exchange OWA server
changes, which causes an upstream chaining error when the site is accessed. It is
also very important that the ISA server is able to resolve the FQDN to the internal OWA
server, and not to an outside interface. This may involve creating a hosts file to redirect
the ISA server to the proper address or by using a different internal DNS zone (splitbrain
DNS).
8. Under the Public Name Details dialog box, select to Accept Request for This Domain
Name (Type Below) and enter the FQDN of the server into the Public Name field (for
example, mail.
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