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UK's O2 network is blocking duckdns.org domains (feddit.uk)

submitted 11 months ago by [email protected] to c/selfhosted

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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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[–] [email protected] 1 points 11 months ago (1 children)

Wouldn't you be on CGNAT though? How are they blocking it - at the DNS level? Have you tried a CNAME record that points your own domain to the actual duckdns domain? Just curious how/why they might be doing this.

[–] [email protected] 3 points 11 months ago* (last edited 11 months ago)

I've been doing some investigating. It's not just DNS. Termux doesn't use the system DNS, it uses Google. But there is still a interference with SSL on 443 and a different page on port 80.

Edit: oh and the IP address is current with ping.