[ntp:questions] Unable to get time from NTP server

Brad Knowles brad at stop.mail-abuse.org
Thu Mar 31 14:26:30 UTC 2005

At 2:05 PM +0000 2005-03-31, Daniel Rudy wrote:

>  /etc/ntp.conf
>  server time.windows.com
>  server clepsydra.dec.com
>  server bitsy.mit.edu
>  server otc1.psu.edu
>  server time.xmission.com
>  server clock.via.net
>  server clock.isc.org
>  server ntp2.sth.netnod.se
>  server ntp2.sp.se
>  server nist1.aol-ca.truetime.com minpoll 8
>  server usno.pa-x.dec.com

Also make sure that you don't list any server for which you have not 
been given explicit authorization to use, or which is on the lists at 
<http://ntp.isc.org/bin/view/Servers/StratumTwoTimeServers> or 
<http://ntp.isc.org/bin/view/Servers/StratumOneTimeServers> and 
specified as "open access".

	You should also take a look at 
<http://ntp.isc.org/bin/view/Servers/NTPPoolServers> and 

	Also, you probably want to be using "iburst" on all these server 
definitions.  See <http://ntp.isc.org/bin/view/Support/StartingNTP4> 
for a variety of other tips on how you can get NTP to start up 

>  restrict mask notrust nomodify notrap kod
>  restrict mask

	See <http://ntp.isc.org/bin/view/Support/ConfRestrict>.  The use 
of "notrust" means that you're requiring all the connections to be 
cryptographically authenticated, which is probably not what you meant.

Brad Knowles, <brad at stop.mail-abuse.org>

"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."

     -- Benjamin Franklin (1706-1790), reply of the Pennsylvania
     Assembly to the Governor, November 11, 1755

   SAGE member since 1995.  See <http://www.sage.org/> for more info.

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