[ntp:questions] NTP servers not accessible on some networks

Jochen Bern Jochen.Bern at LINworks.de
Sun May 18 12:59:47 UTC 2014


On -10.01.-28163 20:59, Antonio Marcheselli wrote:
> I've got some servers which have stopped synchronising on the configured
> NTP server. [...] I thought the NTP server had gone down, but
> then found that in another country I could still sync to the same NTP
> server.
> [...] Any chance some ISPs are blocking some NTP servers or maybe
> port 123 on such servers??

GeoIP blocking (google that) today is an established technology to
protect your publicly-reachable networks, especially if the services
offered aren't meant or even illegal (copyrights) to be offered to the
entire planet. Chances are that access to the NTP servers are a
collateral of a central firewall having had such a feature activated -
not that that'ld help you any ...

Regards,
								J. Bern
-- 
*NEU* - NEC IT-Infrastruktur-Produkte im <http://www.linworks-shop.de/>:
Server--Storage--Virtualisierung--Management SW--Passion for Performance
Jochen Bern, Systemingenieur --- LINworks GmbH <http://www.LINworks.de/>
Postfach 100121, 64201 Darmstadt | Robert-Koch-Str. 9, 64331 Weiterstadt
PGP (1024D/4096g) FP = D18B 41B1 16C0 11BA 7F8C DCF7 E1D5 FAF4 444E 1C27
Tel. +49 6151 9067-231, Zentr. -0, Fax -299 - Amtsg. Darmstadt HRB 85202
Unternehmenssitz Weiterstadt, Geschäftsführer Metin Dogan, Oliver Michel


More information about the questions mailing list