this post was submitted on 01 Aug 2023
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there is a lot more to modern firewall app detection than ports. My Palo Alto has a specific category to detect and block dns over https.
Even Palo Alto notes that they can only effectively block DoH if you're MITMing all https traffic already (e.g. using a root certificate on corporate-managed devices). If not able to MITM the connection, it will still try to block popular DoH providers, though.
https://live.paloaltonetworks.com/t5/blogs/protecting-organizations-in-a-world-of-doh-and-dot/ba-p/313171