Block External Access to the Anydesk Application

Blocking External Access to the Anydesk Application

Hello, good morning.

I'm trying to block external access to the Anydesk application installed on computers on my internal network. I've tried several times to block access by creating firewall rules to block access from WAN to LAN, but to no avail. However, I can normally block access from LAN to WAN using Web Filter, Application Control, or Anydesk's internet service.

Could you help me with the best way to implement this external block?

My goal is for users on my internal network to be able to use Anydesk for remote access normally, but for external access to Anydesk on my local network to be blocked.

Thank you in advance.