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UK's O2 network is blocking duckdns.org domains
(feddit.uk)
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this post was submitted on 09 Dec 2023
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You can try DoH to see if it is working.
It's port 443 so it won't get redirected by their filters.
Android uses DoT so maybe that works. Assuming that they don't block port 853.
Try the encrypted DNS option to see if they are blocking all DNS providers or just certain ones.
You can also setup your own encrypted DNS on a VPS if you're feeling brave.
Yer, I used Rethink DNS in F-Droid to test this already. Basically it's fine when the DNS is encrypted.
Edit: I was wrong. It was just working again generally.Even with DoH DNS, I still see "Access denied" going to duckdns.org and my sites still don't work. Direct IP works. Not sure how this block is working yet.