How to recreate: Install Ngnix proxy manager and any self-hosted web app [Nextcloud, Owncloud, Portainer] in my case Portaniner WebGUI and put Ngnix proxy manager in front of it by using Duck DNS as a dynamic DNS client and setting the record to the Tailscale IP of the machine then after doing all of this when I write the domain name in browser bar it keeps on loading forever with about: blank on the other hand if I write Tailscale IP a with the correct port it loads in a second
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I think this was asked on https://github.com/tailscale/tailscale/issues/3428
It looks like Duck DNS rejects IP addresses in the CGNAT range 100.x.y.z because they are not publicly reachable. https://tailscale.com/kb/1081/magicdns/ can likely do what you're looking for, and can set up TLS certificates as well: https://tailscale.com/blog/tls-certs/.

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After doing dig I got answer : https://pastebin.com/wGzRsurx – king of games Nov 29 '21 at 04:39
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0 I have solved the problem it was not of Duck DNS not working with CGNAT but I forgot to add Portainer to the Ngnix Proxy Manager network so it lead to Ngnix proxy manager not being able to connect to portainer every one who put the effort in solving the problem are appreciated – king of games Nov 29 '21 at 13:52
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I have solved the problem it was not of Duck DNS not working with CGNAT but I forgot to add Portainer to the Ngnix Proxy Manager network so it lead to Ngnix proxy manager not being able to connect to portainer every one who put the effort in solving the problem are appreciated