IIS ARR sets X-Forwarded-For to clientip:port, and the port changes every
connection. Left in, the audit log showed IP:PORT, the dashboard IP fallback
never matched a stored (portless) DashboardDefault.ipaddress, and login rate
limiting keyed per-connection instead of per-host. Add an IPv6-safe
clientip.client_ip / strip_port helper and use it in the audit log, the
dashboard resolver, and the login rate-limit key.
ced356882c