Hello!!
If I enable ufw firewall on my server, should I allow incoming connections to port 5053?
Best regards!! 
If cloudflared is installed on the same machine as Pi-hole, communications between Pi-hole and cloudflared on 127.0.0.1#5053 as Pi-hole's only upstream would be strictly local.
As such, they shouldn't be affected by firewall rules, unless those would filter loopback traffic as well.
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Hello!! 
Yes, that's how I want to do: Cloudfared will be installed on the same VM as Pi-hole, so I understand that I don't have to do anything.
All clear, I'm going to try now...
1000000 thanks and very best regards!! 
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