NTP fails synchronization with server at startup

[Paul Smith]

On Dec 5, 2007 2:24 PM, Paul Smith <phhs80 at gmail.com> wrote:
> > > Yes, Craig, I did reboot the computer after having turned off ipv6,
> > > but it did not solve the problem. It is rather strange that
> > > '/sbin/service ntpd restart' works perfectly and that NTP cannot
> > > synchronize with the server at booting.
> > >
> > This is not strange at all. When it tries to connect at boot, it can
> > not make the connection. When the network is up, it can make the
> > connection. I don't remember for sure, but I believe you were
> > getting a DNS error. This could be because you couldn't reach the
> > name server, or because you are running a local name server, and it
> > isn't up when NTP starts. I would also expect to see this if you
> > were using a wireless connection and network manager configured to
> > make the connection when the user logs in. (User supplied wireless
> > key instead of system supplied wireless key.)
>
> I understand your explanation. I do not use any wireless connection to
> the Internet. Moreover, my Ethernet device is configure to be
> activated when computer starts. What else should I look at?

Again, the output of  'grep ntp tail /var/log/messages':

/var/log/messages:Dec  5 14:00:27 localhost ntpd[2928]: time reset +0.234547 s
/var/log/messages:Dec  5 14:09:42 localhost ntpd[2928]: synchronized
to 193.136.134.3, stratum 2
/var/log/messages:Dec  5 14:26:01 localhost ntpd[2928]: ntpd exiting
on signal 15
/var/log/messages:Dec  5 14:27:34 localhost ntpdate[1951]: can't find
host ntp.ist.utl.pt
/var/log/messages:Dec  5 14:27:34 localhost ntpdate[1951]: no servers
can be used, exiting
/var/log/messages:Dec  5 14:27:34 localhost ntpd[1954]: ntpd
4.2.4p2 at 1.1495-o Mon Sep 24 14:40:07 UTC 2007 (1)
/var/log/messages:Dec  5 14:27:34 localhost ntpd[1955]: precision = 1.000 usec
/var/log/messages:Dec  5 14:27:34 localhost ntpd[1955]: Listening on
interface #0 wildcard, 0.0.0.0#123 Disabled
/var/log/messages:Dec  5 14:27:34 localhost ntpd[1955]: Listening on
interface #1 wildcard, ::#123 Disabled
/var/log/messages:Dec  5 14:27:34 localhost ntpd[1955]: Listening on
interface #2 lo, ::1#123 Enabled
/var/log/messages:Dec  5 14:27:34 localhost ntpd[1955]: Listening on
interface #3 lo, 127.0.0.1#123 Enabled
/var/log/messages:Dec  5 14:27:34 localhost ntpd[1955]: Listening on
interface #4 vmnet8, 192.168.139.1#123 Enabled
/var/log/messages:Dec  5 14:27:34 localhost ntpd[1955]: Listening on
interface #5 vmnet1, 192.168.113.1#123 Enabled
/var/log/messages:Dec  5 14:27:34 localhost ntpd[1955]: kernel time
sync status 0040
/var/log/messages:Dec  5 14:27:34 localhost ntpd[1955]: frequency
initialized 26.857 PPM from /var/lib/ntp/drift
/var/log/messages:Dec  5 14:27:34 localhost ntpd[1955]: getaddrinfo:
"ntp.ist.utl.pt" invalid host address, ignored
/var/log/messages:Dec  5 14:27:35 localhost ntpd[1955]: Listening on
interface #6 vmnet8, fe80::250:56ff:fec0:8#123 Enabled
/var/log/messages:Dec  5 14:27:35 localhost ntpd[1955]: Listening on
interface #7 vmnet1, fe80::250:56ff:fec0:1#123 Enabled
/var/log/messages:Dec  5 14:28:36 localhost ntpd[1955]: Cannot find
existing interface for address 193.136.134.3
/var/log/messages:Dec  5 14:28:36 localhost ntpd_initres[1959]: ntpd
indicates no data available!
/var/log/messages:Dec  5 14:29:36 localhost ntpd[1955]: Cannot find
existing interface for address 193.136.134.3
/var/log/messages:Dec  5 14:29:36 localhost ntpd_initres[1959]: ntpd
indicates no data available!
/var/log/messages:Dec  5 14:30:36 localhost ntpd[1955]: Cannot find
existing interface for address 193.136.134.3
/var/log/messages:Dec  5 14:30:36 localhost ntpd_initres[1959]: ntpd
indicates no data available!

Paul