this post was submitted on 09 Dec 2023
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It too me a while to work out why my Nextcloud stuff wasn't working on my phone. It wasn't until I went to http://duckdns.org on mobile data I saw the block. I had changed ISP from one with IPv6, which I had setup, to an ISP without it, and thought it might be that. But it was just coincidence.

I've written to O2 but I doubt they will change anything, so I'll be changing network.

So heads up UK O2 self hosting people!

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[–] randombullet@feddit.de 0 points 9 months ago

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.

[–] Lemmchen@feddit.de 0 points 9 months ago* (last edited 9 months ago) (1 children)

If it's just a DNS block, you could use a different DNS server. You should do this anyway in my opinion.

[–] jabjoe@feddit.uk 0 points 9 months ago (1 children)

It's not the DNS server. I'm sure of this because Termux uses a different DNS server but does the same. I also tried setting my phone to use OpenDNS directly. I'm pretty sure they are inspecting the DNS traffic. Exactly so changing DNS server doesn't help.

I don't see a problem when using IP directly. I mean the IP is static, so I could must buy a domain, but I'd also have to piss about with my setup.

[–] Lemmchen@feddit.de 0 points 9 months ago

Modern Android versions can use DoH (DNS over HTTPS) which can not be intercepted. If you don't have this option or are not sure how to configure it, you could use the Quad9 app to enable secure DNS. This way you can make sure it is not related to DNS. Frankly, I can't imagine they are blocking the IPs of the DuckDNS servers directly.