[ntp:questions] Re: firewall setting question

Steve Kostecke kostecke at ntp.isc.org
Fri Dec 2 15:10:20 UTC 2005

On 2005-12-02, calendarw <calendarw at gmail.com> wrote:

> I have installed a windows version of ntp server which named
> ntp-4.2.0-nt, and I cannot use #ntpdate stdtime.gov.hk to get time
> from time server. But it can use a #ntpdate -u stdtime.gov.hk get the
> time sometime.

The '-u' option causes ntpdate to use an unprivileged port (i.e >1024)
instead of the NTP port (123).

You need to have port 123/UDP opened in all firewalls between your ntpd
and the remote time servers.

Steve Kostecke <kostecke at ntp.isc.org>
NTP Public Services Project - http://ntp.isc.org/

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