For all
external access from clients either using Offi ce Communicator or Live Meeting, the servers
these users will access for communications to OCS 2007 need to now have port 443 opened
on the fi rewall to provide the proper fl ow of communications.
342 Chapter 11 ??? Upgrading to Offi ce Communications Server 2007
Preparing Certifi cates
Because the key to any communications that are external to an organization is to ensure
that the communications are secure, the use of certifi cates was standard with LCS 2005 for
federated communications or with remote LCS 2005 clients. When replacing servers from
LCS 2005 to OCS 2007, you need to transfer the certifi cates. Because certifi cates are keyed
to server names, if you keep the same server name for the new OCS 2007 server as the old
LCS 2005 server, you can simply export the key from LCS 2005 and import it into the
OCS 2007 server with the same name. If you add a new OCS 2007 server with a completely
different name, you will need to request a new certifi cate that matches the new server name.
You can issue certifi cates to the new OCS 2007 server in one of two ways: have a new
certifi cate issued to OCS 2007; or have an old LCS 2005 certifi cate exported so that it can
be imported into OCS 2007. The two methods are detailed in the following sections.
Exporting a Certifi cate from LCS 2005
If you will be using the same server name for OCS 2007 as one of the LCS 2005 servers
that currently exist, export the certifi cate from LCS 2005 and import it into OCS 2007.
Pages:
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369