Time server sync

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#1 Tue, 08/02/2011 - 21:55

Time server sync

In Webmin> Hardware> System Time> on the Time server sync tab is a filed “Timeserver hostnames or addresses” Can some one please tel me what goes in there. I have tried many different thing and always get errors like below.

NTP time synchronization failed : Error : Name or service not known 3 Aug 10:45:22 ntpdate[29901]: can't find host http://www.ntp.org 3 Aug 10:45:22 ntpdate[29901]: no servers can be used, exiting

NTP time synchronization failed : 3 Aug 10:46:35 ntpdate[29938]: no server suitable for synchronization found

Wed, 08/03/2011 - 04:13

Just enter the hostname of the time server there, no "http://" or similar. We're talking hosts there, not web URLs. :)

A list of public time servers can e.g. be found here: http://support.ntp.org/bin/view/Servers/StratumOneTimeServers

Thu, 08/04/2011 - 07:34

Hi Locutus

Thanks for your response. So you mean something like ntp.amnic.net or ntp.tbpl.com.au. If that is correct I have tried lots of different ones from the link you provided but in every case I get an error like in my last post. I have even looked at the configuration to see if there is anything that I think would help but I don’t see anything that would make the difference.

Have you tried entering it on your server and what result did you get? If you are getting the same or a similar result them maybe I need to report it to Jamie or Joe and see if it is an bug?

Thanks for you for your input Allan

Thu, 08/04/2011 - 08:23

Yes, I have entered the timeserver of my hoster there (ntp1.hetzner.de), and that works without problem. I also just tried "ntp0.nl.net" as an example from the list I posted, and that works as well.

So no matter what host you enter there, you get an error that the hostname can't be found? Maybe you have a general issue with name resolution on your server?

Thu, 08/04/2011 - 11:47

Hi Locutus

I just tried the two timeservers you have working and got this error.

NTP time synchronization failed : 5 Aug 00:43:15 ntpdate[23076]: no server suitable for synchronization found

Any suggestions what to look for with name resolution and where to find it

Thanks for you help Allan

Thu, 08/04/2011 - 12:51

Okay, that message does not really look like a name resolution problem. Maybe some packet filter is blocking access to external time servers.

Where are you located, what is your hoster/ISP?

What reply do you get for these?

dig ntp2.fau.de
ping ntp2.fau.de
ntpdate ntp2.fau.de