我遇到一个问题，在我的服务器上运行 ntpdate 没有返回任何数据，因此出现以下错误：
[root@server etc]# ntpdate -d -u -v time.nist.gov
12 Apr 01:10:09 ntpdate[32072]: ntpdate [email protected] Fri Nov 18 13:21:21 UTC 2011 (1)
Looking for host time.nist.gov and service ntp
host found : 24-56-178-141.co.warpdriveonline.com
transmit(24.56.178.141)
transmit(24.56.178.141)
transmit(24.56.178.141)
transmit(24.56.178.141)
transmit(24.56.178.141)
24.56.178.141: Server dropped: no data
server 24.56.178.141, port 123
stratum 0, precision 0, leap 00, trust 000
refid [24.56.178.141], 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: d3303975.1311947c Thu, Apr 12 2012 1:10:13.074
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
12 Apr 01:10:14 ntpdate[32072]: no server suitable for synchronization found
我尝试在线谷歌搜索“未找到适合同步的服务器”错误，并尝试禁用防火墙（运行 iptables -L 没有返回任何规则）。我还向我的 DC 确认没有阻止 ntp（端口 123）的规则。
有人知道我该如何解决这个问题吗？
顺便说一下，在另一个 DC 中的工作服务器上的输出应该是这样的：
11 Apr 19:01:24 ntpdate[725]: ntpdate [email protected] Fri Nov 18 13:21:17 UTC 2011 (1)
Looking for host 184.105.192.247 and service ntp
host found : 247.conarusp.net
transmit(184.105.192.247)
receive(184.105.192.247)
transmit(184.105.192.247)
receive(184.105.192.247)
transmit(184.105.192.247)
receive(184.105.192.247)
transmit(184.105.192.247)
receive(184.105.192.247)
transmit(184.105.192.247)
receive(184.105.192.247)
transmit(184.105.192.247)
server 184.105.192.247, port 123
stratum 2, precision -20, leap 00, trust 000
refid [184.105.192.247], delay 0.18044, dispersion 0.00006
transmitted 4, in filter 5
reference time: d330364e.e956694f Wed, Apr 11 2012 18:56:46.911
originate timestamp: d3303765.8702d025 Wed, Apr 11 2012 19:01:25.527
transmit timestamp: d3303765.73b213e3 Wed, Apr 11 2012 19:01:25.451
filter delay: 0.18069 0.18044 0.18045 0.18048
0.18048 0.00000 0.00000 0.00000
filter offset: -0.00195 -0.00197 -0.00211 -0.00202
-0.00202 0.000000 0.000000 0.000000
delay 0.18044, dispersion 0.00006
offset -0.001970
答案1
服务器24.56.178.141拒绝所有未经身份验证的请求 - 它不会响应正常查询。
time.nist.gov我建议不要使用 DNS 名称，而是从 NIST 的服务器列表。