
Chapter 9: Confi guring the Edge Transport Server Role
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The second scenario, which is the one recommended for the Hub Transport server, occurs when edge
subscription and EdgeSync are performed. In this scenario, to prepare the Hub Transport server, you
should perform the following tasks. The edge subscription process is discussed in greater detail later in
this chapter.
1. Ports: Verify that the perimeter network firewall that separates the Edge Transport server from
the Exchange organization is configured to enable communications on the following specified
ports. Because EdgeSync replicates data between Active Directory and ADAM, secure LDAP
port 50636 for TCP communication must be opened on the firewall to enable directory
synchronization from the Hub Transport to ADAM on the Edge Transport server. Recall
that synchronization is single directional, hence the port can be opened one - way from the Hub
to the perimeter network. As in the previous scenario, also ensure that SMTP port 25 is open on
the firewall for both the Edge Transport and Hub Transport servers to send and receive emails.
2. DNS: The Edge Transport servers in the perimeter network and the Hub Transport servers in
the Exchange organization must be able to locate each other by using host name resolution. You
must specify the appropriate DNS suffix for the Edge Transport server prior to its installation. ...