Which sites does the CloudN device require to have connectivity to?

CloudN requires access to some ports/hosts. Please take a look here

Please take a look at for more information

Site2Cloud not coming up?

Pleae make sure that if there are any firewalls or routers in between the CloudN and Transit Gateways - they should allow port 500 and port 4500 traffic between CloudN’s wan/etho0 interface and Transit Gateway.