[ntp:questions] no server suitable for synchronization?
zhangweiwu at realss.com
Mon Feb 21 13:58:52 UTC 2005
Brad Knowles wrote:
> At 8:56 PM +0800 2005-02-21, Zhang Weiwu wrote:
>> sappho ~ # ntpdate -v 2.pool.ntp.org
>> 21 Feb 20:50:06 ntpdate: ntpdate 4.2.0a at 1.1190-r Tue Dec 7
>> CST 2004 (1)
>> 21 Feb 20:50:10 ntpdate: no server suitable for synchronization
>> (querying 0.pool.ntp.org and 1.pool.ntp.org fails alike)
>> Since I noticed nobody else is talking about it on the web, I guess
>> it's either my ICP or the new great Chinese firewall. Any suggestions?
> It would help to have more debugging information, specifically to
> know which particular servers (by IP address) you were trying to query.
> Sometimes pool.ntp.org has a hiccup, and the servers that are returned
> are not actually functioning correctly. This is rare, but it does
> sometimes happen.
I will try to figure out how to detect which IP address am I querying.
However I don't think it's the fault of a particular server because I
have tried .pool.ntp.org for a long time and I have cronjob tries
to correct time each 1 hour, but my time is still incorrect after
> If you could tell us what IP addresses you were querying, and give
> us more information as to the process ntpdate went through at the time,
> we could give you an idea of whether those servers should be functional
> and whether you might be experiencing a firewall problem.
I am not experienced enough to sniff network traffic, the only thing I
could do I guess is to take this debug info.
There is a NAT firewall in our company but I think it's no problem
because this firewall is configured by me to only stop outside connect
to local port but not vise-versa.
sappho ~ # ntpdate -d 1.pool.ntp.org
21 Feb 21:57:01 ntpdate: ntpdate 4.2.0a at 1.1190-r Tue Dec 7
21:59:12 CST 2004 (1)
Looking for host 1.pool.ntp.org and service ntp
host found : rosehip.exnet.com
18.104.22.168: Server dropped: no data
server 22.214.171.124, port 123
stratum 0, precision 0, leap 00, trust 000
refid [126.96.36.199], delay 0.00000, dispersion 64.00000
transmitted 4, in filter 4
reference time: 00000000.00000000 Thu, Feb 7 2036 14:28:16.000
originate timestamp: 00000000.00000000 Thu, Feb 7 2036 14:28:16.000
transmit timestamp: c5c46731.c5ef5232 Mon, Feb 21 2005 21:57:05.773
filter delay: 0.00000 0.00000 0.00000 0.00000
0.00000 0.00000 0.00000 0.00000
filter offset: 0.000000 0.000000 0.000000 0.000000
0.000000 0.000000 0.000000 0.000000
delay 0.00000, dispersion 64.00000
21 Feb 21:57:06 ntpdate: no server suitable for synchronization found
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