# ==> /etc/systemd/system/yahns.socket <==
[Unit]
Description = yahns sockets

[Socket]

# yahns can handle an arbitrary number of listen sockets,
# so I prefer to keep listeners for IPv4 and IPv6 separate
# to avoid ugly IPv4-mapped-IPv6 addresses for IPv4 clients:
# (e.g ":ffff:10.0.0.1" instead of just "10.0.0.1").
ListenStream = 0.0.0.0:443
BindIPv6Only = ipv6-only
ListenStream = [::]:443
Service = yahns@1.service

[Install]
WantedBy = sockets.target