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unbound

Setup DoT (DNS-over-TLS) on unbound​

Use Unbound as an upstream DNS-over-TLS forwarder you can with the forward-addr parameter in the unbound.conf file.

Find the nearest DoT server​

You can try to check the nearest server for you, as example with nslookup or dig commands:

nslookup -port=53 ada.openbld.net 1.1.1.1

Output:

Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
Name:	ada.openbld.net
Address: 104.152.xx.xx
Name:	ada.openbld.net
Address: 109.199.xx.xx

Make sure, the service is working, try to connect any server to 853 port:

telnet 104.152.xx.xx 853 
Trying 104.152.xx.xx...
Connected to 104.152.xx.xx.

Next step — take any IP and try to setup your server.