No, you are correct. If you are the only person accessing the service you don’t need to open any ports since you access your network via Wireguard anyway.

It tries to install the associated package when given a path to a configuration file.

I used to run multiple containers with TrueNAS Scale through their apps system (not as a VM in TrueNAS) and it was very unstable. I constantly had to fix something and the apps had constant updates even though there were no updates to the apps itself. It was really annoying to work with. I switched to Fedora Server and it has been much better since.

That’s what I thought.

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that honestly had me wondering just how the FritzBox knows the ISP doesn’t allow it, but that’s a different topic

Because the Fritzbox uses a DS-Lite tunnel.

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Immich is by far the best and most convenient.