> - Tunnel gateway maintains two channels with the client. A control channel is established over TCP, and TLS. This also serves as a backup data channel. It then looks to establish a UDP channel using DTLS (Datagram TLS, an implementation of TLS over UDP) that serves as the main data channel. If the UDP channel fails to establish or is temporarily unavailable, the backup channel over TCP/TLS is used. By default port 443 is used for both TCP and UDP, but this can be customized via the Intune Server Configuration - [*Server port* setting](../protect/microsoft-tunnel-configure.md#create-a-server-configuration). If changing the default port (443) ensure your inbound firewall rules are adjusted to the custom port.
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