ntpd query failure

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We run 'ntpdate -q' once daily to check the ntpd sync status of the hosts in
our network. On one host, this check is failing sporadically today:

$ for i in `seq 1 10` ; do ntpdate -q 192.168.129.110 ; sleep 1 ; done
server 192.168.129.110, stratum 4, offset -0.001034, delay 0.02693
24 May 10:11:16 ntpdate[3742]: adjust time server 192.168.129.110 offset -0.001034 sec
server 192.168.129.110, stratum 4, offset -0.000997, delay 0.02701
24 May 10:11:17 ntpdate[3747]: adjust time server 192.168.129.110 offset -0.000997 sec
server 192.168.129.110, stratum 4, offset 0.000000, delay 0.00000
24 May 10:11:18 ntpdate[3752]: no server suitable for synchronization found
server 192.168.129.110, stratum 4, offset 0.000000, delay 0.00000
24 May 10:11:19 ntpdate[3757]: no server suitable for synchronization found
server 192.168.129.110, stratum 4, offset -0.000162, delay 0.02878
24 May 10:11:20 ntpdate[3762]: adjust time server 192.168.129.110 offset -0.000162 sec
server 192.168.129.110, stratum 4, offset 0.000000, delay 0.00000
24 May 10:11:21 ntpdate[3767]: no server suitable for synchronization found
server 192.168.129.110, stratum 4, offset 0.000000, delay 0.00000
24 May 10:11:22 ntpdate[3772]: no server suitable for synchronization found
server 192.168.129.110, stratum 4, offset 0.000000, delay 0.00000
24 May 10:11:24 ntpdate[3777]: no server suitable for synchronization found
server 192.168.129.110, stratum 4, offset -0.001079, delay 0.02701
24 May 10:11:25 ntpdate[3782]: adjust time server 192.168.129.110 offset -0.001079 sec
server 192.168.129.110, stratum 4, offset 0.000000, delay 0.00000
24 May 10:11:26 ntpdate[3787]: no server suitable for synchronization found

It seems to fail 6/10 checks consistently, whereas normally it succeeds on all
attempts.

This is the ntpd configuration on 192.168.129.110:

$ cat /etc/ntp.conf
driftfile /var/lib/ntp/drift

server 192.168.24.39
server 192.168.24.80
server 192.168.132.51
server 192.168.132.83

$ cat /etc/sysconfig/ntpd
# Drop root to id 'ntp:ntp' by default.
OPTIONS="-u ntp:ntp -p /var/run/ntpd.pid -x"

The host is running F12, 2.6.32.10-90.fc12.x86_64. I was previously seeing this
ntp sync problem on F12, 2.6.32.11-99, so I thought it was a problem with that
kernel, but apparently not.

- Kelvin
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