My SSL-certificate works perfectly fine over WIFI (at least over my home network, where the server runs and over the WIFI of a friend). But for some reason if I switch to mobile network the https site won’t load (ERR_ADDRESS_UNREACHABLE in the chrome app). The http site still loads (I disabled the redirect to https for testing purposes).
I have no idea if I did something wrong in my server config or if it is just an issue of the certificate.
But I hope you can help me hear.
Thanks in advance
The first thing to note is that your website is IPv6-only. It has no IPv4 address. Is that intentional?
Can you confirm that your mobile network actually supports IPv6? Visit https://test-ipv6.com/ from your mobile network.
Edit: sorry, i didn’t notice that your HTTP site works just fine from mobile. I think this then maybe be either an MTU or firewalling issue (or both). SSL tends to bring MTU issues out of the woodwork due to large packet sizes.
To your edit:
I have a MTU of 1500 (temporarily changed it to 9000, but didn’t changed anything).
If it could be because of MTU, do you have any further things that I could test?
And I don’t think I have any additional firewall on my server (raspberry). Or do you mean a firewall of my phone?
Small addition: I don’t know if it is important, but if I ping my domain or my ipv6 directly over online ping tools, I get a packet loss of 100%