FreeBSD Security Advisory FreeBSD-SA-14:31.ntp

[Andrei]

On Wed, 24 Dec 2014 00:33:09 +0100 (CET)
FreeBSD Security Advisories <security-advisories at freebsd.org> wrote:

> No workaround is available, but systems not running ntpd(8) are not
> affected.  Because the issue may lead to remote root compromise, the
> FreeBSD Security Team recommends system administrators to firewall NTP
> ports, namely tcp/123 and udp/123 when it is not clear that all
> systems have been patched or have ntpd(8) stopped.

Why tcp/123?

Kind regards,
Andrei.