In the web interface, I’m unable to select IPv6 as an interface option from the dropdown menu when editing a port, only 0.0.0.0 is available. If I manually enter :: as the interface in the config file and restart, I receive the error address already in use (system error 98).
This is expected behaviour on most Linux systems, as they typically have dual-stack support enabled by default. When a service starts listening on either IPv4 or IPv6, the port is often reserved for both, leading to this conflict.

One possible solution would be to implement proper dual-stack support (e.g. by adding a specific option for it), or alternatively, to use :: as the default interface – as most operating systems interpret this as binding to all interfaces (*:<port>).

Apart from this, it's working great.