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How to check to see whether DNS over TLS is blocked in my network by ISP?
I'm looking for a method to check whether DNS over TLS is blocked in my network by my ISP or not. A method that isn't just trial and error of a bunch of popular DoT providers to see which one connects because I need to know for a fact that my ISP is using a block list or well-known DoT providers or they are using a technique (if any?) to block all DoT connections entirely.
I've tried lots of DoTs but none of them work on my Internet, DoH works though, most likely because it uses the same port 443 as the rest of the HTTPS web traffic.
Is there a fundamental method to use to find out which protocols, such as DoT, VPN protocols etc. are being blocked in a network by the ISP, administrator etc.?
