Synchronization and messaging connection are encrypted by default. However, for replication connections that use E2EE, the client must be configured correctly to establish connections to the correct HTTP or HTTPS port.
Connecting to the TLS Relay Server Port with Client APIS
(Applies only to Windows Mobile and Android devices with replication packages). With the Relay Server environment configured, developers can set appliction client properties to connect to it via the correct port using the TLS protocol.