DESCRIPTION: Manually opening Ports from Internet to a server behind the remote firewall which is accessible through Site to Site VPN involves the following steps to be done on the local SonicWall.
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Short guide to VPN port forwarding : What it is, How to do it
Sep 22, 2017 VPN vs. Firewall - Which is Better and for What? - Best 10
NOTE: These ports need to be open at the gateway/firewall as well as on the controller host. This would be achieved by creating port forwards on the gateway/firewall where the controller host is located.
Cisco AnyConnect VPN connected through a firewall | Freerk