Accessing nextcloud via ipv6 and client issues

My experience is the same, it looks Android prefers IPv6 (and Win10 as well from ~2020)

In your Fritzbox you can configure port sharing for IPv4 and IPv6 separately. maybe you just didn’t share your NC system for IPv6?

It’s crucial - for IPv6 you can’t share specific IP address… So far I understand you can only tie the share to specific MAC address (directly connected to Fritzbox) by choosing the system from a drop-down menu. I’m using docker so maybe this limitation doesn’t apply to your system.

some references:

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