And because this directory must be accessible to internal as
well as external users, it must have a certifi cate with the internal FQDN as the subject and
the external FQDN as a subject alternate name. Unfortunately, subject alternate name
certifi cates are not supported for this use: You must pick either the internal name or the
external name.
This is where the ISA server comes in. The ISA server sits in your perimeter network
and securely publishes your address book to the outside world. You can assign an external
FQDN such as addressbook.contoso.com and have ISA publish your internal address book to
the outside with the new name.
170 Chapter 5 ??? Confi guring the Edge Server
Testing the Edge Server
The best way to test the Access Edge Server is to log in to your OCS client from a machine
outside your fi rewall and test as many features as possible. This section walks you through the
way to test most aspects of the Edge Server.
Testing the Access Edge
Log in to the client and make sure all your contacts, including federated or public contacts,
appear. If the client logs in successfully, the Access Edge Server is working properly. Send IMs
to your contacts and make sure their presence appears correctly in your client. Test to see
whether your public and federated contacts can send you IMs.
If you are unable to log in to the OCS server from outside the fi rewall, you most likely
have a problem with either the Edge Server or the underlying network components.
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