[ntp:questions] NTP server can not synchronize with external NTP server

nast linux nastlinux at gmail.com
Mon Jan 11 08:25:01 UTC 2010

Hai David,

Thanks for reply,

I already ask to network admin to open udp 123 for time.nist.gov.
And I checked my server at firewall log that could send udp 123 to
But I checked no paket from time.nist.gov.


On Fri, Jan 8, 2010 at 2:48 PM, David Woolley
<david at ex.djwhome.demon.invalid> wrote:

> nast linux wrote:
>> I got the problem, my NTP server can not synchronize with external NTP
>> server.
>>  Firewall.  In particular these days, OS' firewall.
> As you are using a pool server, the other possibility, of trying to use a
> V3 server with a V4 client, without setting the client downversion,
> shouldn't apply.
> ntpdate is failing as well, which suggests extensive firewalling, as that
> typically uses unprivileged ports.
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