[root@i158 ~]# ntpdate -u time.uuwatch.com
9 Jul 11:18:50 ntpdate[853]: no server suitable for synchronization found
[root@i158 ~]# ntpdate -d time.uuwatch.com
9 Jul 11:20:01 ntpdate[896]: ntpdate 4.2.6p5@1.2349-o Sat Nov 23 18:21:48 UTC 2013 (1)
Looking for host time.uuwatch.com and service ntp
host found : master.uc.uuwatch.com
transmit(192.168.5.211)
transmit(192.168.5.211)
transmit(192.168.5.211)
transmit(192.168.5.211)
transmit(192.168.5.211)
192.168.5.211: Server dropped: no data
server 192.168.5.211, port 123
stratum 0, precision 0, leap 00, trust 000
refid [192.168.5.211], delay 0.00000, dispersion 64.00000
transmitted 4, in filter 4
reference time: 00000000.00000000 Mon, Jan 1 1900 8:05:57.000
originate timestamp: 00000000.00000000 Mon, Jan 1 1900 8:05:57.000
transmit timestamp: d94866e4.6f1188a9 Thu, Jul 9 2015 11:20:04.433
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
offset 0.000000
9 Jul 11:20:05 ntpdate[896]: no server suitable for synchronization found
原文：http://www.cnblogs.com/itcomputer/p/4632641.html