Ports closed. No access from outside home network. But where's the problem?!

[Schmu]

Hi @kittysuzuki

Looks like you found my post and the other thread already. I link it here anyway for other visitors:

NextcloudPi external access with DS-Lite

Hi, Just adding some information here and hope it helps. DS-Lite means: you have your own IPv6 address (so you are reachable via IPv6) you share an IPv4 address with many users (packets are transferred to you via NAT - that’s why you are not reachable via IPv4) Disabling DS-Lite to me sounds like: you no longer get an IPv4 address you will only surf the Internet with your IPv6 address you won’t be able to connect to servers that have an IPv4 address only The other option that allows you …

As you can read from the other post, you need your own IPv4 address or you switch to IPv6 with some more effort.
For your own IPv4 address most ISPs offer an “IPv4 option”, meaning your ISP will activate an IPv4 address for you either for free or you have to pay a monthly fee.