I installed Nextcloud AIO locally without exposing to internet and everything is default and green. I prefer it that way, you know, to avoid spooky people.
However, I had a jump scare yesterday, where I tried to call some contact and s/he told me that their nextcloud talk rang, and yes, I confirmed, it’s ringing even though s/he is not in my local network. However, they are not able to access the nextcloud without the vpn. But still, Im wondering why is it happening?
Help me understand how is that possible? Nextcloud AIO has an outbound access but I never forwarded any ports. And its not possible to forward any ports on my ISP anyway, its under CGN, so yeah…