[ntp:questions] NTP not syncing

Steve Kostecke kostecke at ntp.org
Mon Nov 25 18:20:34 UTC 2013

On 2013-11-25, Antonio Marcheselli <puppa at me.la> wrote:

>> 'restrict' sets a null restriction set for that address.
>> IOW it removes all restrictions.
> I had a look at the 'restrict' parameters; the line I have is
> restrict mask nomodify
> which I understand prevents from modifying the NTP 
> configuration, is that correct?

'nomodify' blocks the use of ntpq / ntpdc remote configuration commands.
'nomodify' does not prevent someone sending the time to your ntpd. 

'restrict nomodify' replaces the default restriction with
'nomodify' for

FWIW ... NTP remote configuration is not possible unless one of the
following conditions are met:

1. ntpd is started with the command-line option which disabled


2. ntp.conf contains the configuration directive to disable authenticate


3. the non-trivial symmetric key configuration is correctly completed
_and_ the remote user possesses the correct authentication credentials

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

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