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I use a VPN in my ASUS Merlin flashed router and I have tried GRC's Shields Up and Zenmap (Nmap) to scan my router via another VPN to see if my VPN port in the router was open and it says stealthed/filtered. Even Shodan shows nothing on my WAN IP address. So how in the world am I able to make a connection to my VPN when the port is stealthed/filtered? I do use a dynamic domain name if that helps.