Prerequisites

To ensure a smooth connection between every SD-WAN appliance and the components/devices to be reached in the Cloud for deploying your network, check that the following ports are open.

From SD-WAN appliance	to Server/Portal in the Cloud	Type of Communication	Port
	ZTP provisioning and configuration	https	443
	SD-WAN Orchestrator	https	443
	Upgrade	https	443
	NTP clock synchronization	UDP	123

Appliances in IPsec overlays

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Spoke Site: UDP:500 and UDP:4500 outbound connections

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Hub Site: local port forwarding of UDP:500 and UDP:4500 inbound from the public IP address to the hub appliance