Also
verify that on the Edge Transport server, you can connect locally to the LDAP port 50389. This is
the port to access the ADAM instance. An easy way to test this is to use the ldp.exe utility found
in the C:\WINDOWS\ADAM directory. Connect using the NetBIOS name of the Edge Transport
server and if no credentials are specified, it binds with the credentials of the locally logged -on
user. Finally, 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.
On the DNS servers that both the Edge Transport and Hub Transport servers are configured to
point to, configure host records in the appropriate forward lookup zones to resolve each server.
Alternatively, you can create host file entries on both the Edge Transport and Hub Transport
servers to resolve each other.
3. License Edge Transport Server: You should license the server prior to running edge subscription
so that the subscribed Edge Transport server will appear as a licensed server.
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