topic Re: NTP - no server suitable for synchronization found in Operating System - Linux

NTP - no server suitable for synchronization found

Chapaya — Wed, 19 Nov 2008 17:41:48 GMT

Hi ,

when i'm trying to sync ntp on server by :
ntpdate , i get :

no server suitable for synchronization found

Re: NTP - no server suitable for synchronization found

Ivan Ferreira — Wed, 19 Nov 2008 18:41:55 GMT

Please post the output of:

ntpq -pn

Manu possible reasons, firewall, service down, etc.

Re: NTP - no server suitable for synchronization found

Chapaya — Wed, 19 Nov 2008 20:13:27 GMT

[root@boris root]# ntpq -pn ntp_1
ntp_1: timed out, nothing received
***Request timed out

Re: NTP - no server suitable for synchronization found

Ivan Ferreira — Wed, 19 Nov 2008 20:52:45 GMT

That means that you cannot reach the NTP server. You should receive a result like this:

# ntpq -pn billbd1
remote refid st t when poll reach delay offset jitter
==============================================================================
+200.55.63.254 200.160.0.8 3 u 15 64 373 315.030 -4.358 141.480
-200.80.32.172 146.164.48.5 2 u 18 64 177 407.200 -44.299 15.230
216.27.190.202 0.0.0.0 16 u 925 1024 0 0.000 0.000 16000.0
*200.19.74.21 200.19.119.69 2 u 75 64 367 290.790 -0.492 8.820

Possible causes are:

Firewall
Selected NTP server is not running the NTP service
Selected NTP server has restrict options in /etc/ntp.conf

Re: NTP - no server suitable for synchronization found

Ivan Ferreira — Wed, 19 Nov 2008 21:07:31 GMT

I see in your profile:

I have assigned points to 47 of 140 responses to my questions.

Please keep asigning points.

Cheers.

Re: NTP - no server suitable for synchronization found

Fredrik.eriksson — Thu, 20 Nov 2008 09:34:54 GMT

You should try to sync with an external server if you network allows you to, here's a list of open NTP servers:
http://support.ntp.org/bin/view/Servers/StratumOneTimeServers

Also, I do agree with Ivan. Make sure that you're allowed to connect to port 123 with UDP throu your internal linux firewall :)

Best regards
Fredrik Eriksson

Re: NTP - no server suitable for synchronization found

Jeeshan — Thu, 20 Nov 2008 19:04:47 GMT

where you put the ntp server information?

Re: NTP - no server suitable for synchronization found

Fredrik.eriksson — Fri, 21 Nov 2008 08:02:33 GMT

In your /etc/ntp.conf you can put a line looking like this:

server ntp1.sp.se prefer
server ntp2.sp.se

But what I would do is to try running:
$ ntpdate ntp1.sp.se

And see if you're allowed to change the time from an external source. This way you'll know if it's something wrong with your internal NTP service or if your linux box just isn't letting you set the time.

Best regards
Fredrik Eriksson

Re: NTP - no server suitable for synchronization found

Chapaya — Fri, 21 Nov 2008 11:10:09 GMT

it's probably firewall issue . i will update you soon .