In some cases, you need to configure a connection to an external data system which is separated by a firewall from the computer running Synchronization Service. To implement this scenario, you can install an instance of Synchronization Service and built-in connectors on a remote computer and switch this Synchronization Service instance in the remote mode. This will allow the Synchronization Service instance running in the local mode to communicate with the remotely installed instance and connectors via a single port.
Consider a scenario where you want to synchronize data between two Active Directory domains that are separated by a firewall. In this case, you can install one Synchronization Service instance in the local mode in the first domain, and then deploy another Synchronization Service instance in the remote mode in the other domain. Then, ensure the firewall allows traffic on the port used for communications between the Synchronization Service instances.
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