Documentation for systemd socket activation should contain following:

• systemd-resolved should be disabled
• kresd.socket should be enabled and not the kresd.service (which is being activated, but this might be unclear to casual systemd users)
• for listening on public interfaces w/ socket activation is necessary to add FreeBind=true directive into [Socket] section
• maybe socket file can contain FreeBind=true by default as it is no harm on local interfaces

Hopefully this will make it easier for people who struggle to use systemd socket activated kresd.

Regards.