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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[–] socphoenix@midwest.social 10 points 11 months ago (7 children)

T-mobile was doing this in the US but only blocking certain ports when talking to my home server, might try putting it on a non-standard port as well and see if you can access the service then.

[–] jabjoe 7 points 11 months ago (6 children)

Oh I know some ports are ok. My SSH and WireGuard get through. Port 80 is redirected to a block page place holder and 443 is interfered with so SSL fails.

[–] SheeEttin@lemm.ee 2 points 11 months ago (1 children)

Okay, so just run it on a different port.

[–] jabjoe 1 points 11 months ago (1 children)

Tried it. Makes no odds.

Interestingly it's fine if I use the static IP directly.

They are doing some packet inspection by the looks of it. Some rule like:

On IP address found from duckdns, mess with SSL and rewrite HTTP to go to this block page.

[–] SheeEttin@lemm.ee 1 points 11 months ago (1 children)

That is weird then. I'd change dynamic DNS providers.

[–] jabjoe 1 points 11 months ago

I don't know which other ones they have done this to. Also it's a faff to move domain now. If I'd move domain, I'd just buy one as the IP is static.

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