ntpdate[3912]: no server suitable for synchronization found
16,134
You need to configure your firewall to allow UDP replies on port 123.
Related videos on Youtube
Author by
nomizzz
Updated on September 18, 2022Comments
-
nomizzz over 1 year
I've configured ntpd on a CentOs install with a simple /etc/ntp.conf with only 3 lines:
server 0.pool.ntp.org server 1.pool.ntp.org server 2.pool.ntp.org server 192.168.1.1
Unfortunately, no matter what host I run against I cannot get ntpdate to properly sync with an external server. Here is the debug output I get when I run it:
[root@myhost superuser]# ntpdate -d pool.ntp.org 3 May 12:23:31 ntpdate[3912]: ntpdate [email protected] Fri Feb 22 11:23:28 UTC 2013 (1) Looking for host pool.ntp.org and service ntp host found : 173.44.32.10 transmit(173.44.32.10) transmit(69.41.163.31) transmit(18.85.44.118) transmit(65.182.144.36) transmit(173.44.32.10) transmit(69.41.163.31) transmit(18.85.44.118) transmit(65.182.144.36) transmit(173.44.32.10) transmit(69.41.163.31) transmit(18.85.44.118) transmit(65.182.144.36) transmit(173.44.32.10) transmit(69.41.163.31) transmit(18.85.44.118) transmit(65.182.144.36) transmit(173.44.32.10) transmit(69.41.163.31) transmit(18.85.44.118) transmit(65.182.144.36) 173.44.32.10: Server dropped: no data 69.41.163.31: Server dropped: no data 18.85.44.118: Server dropped: no data 65.182.144.36: Server dropped: no data server 173.44.32.10, port 123 stratum 0, precision 0, leap 00, trust 000 refid [173.44.32.10], delay 0.00000, dispersion 64.00000 transmitted 4, in filter 4 reference time: 00000000.00000000 Thu, Feb 7 2036 1:28:16.000 originate timestamp: 00000000.00000000 Thu, Feb 7 2036 1:28:16.000 transmit timestamp: d52e6306.7c9cb981 Fri, May 3 2013 12:23:34.486 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 server 69.41.163.31, port 123 stratum 0, precision 0, leap 00, trust 000 refid [69.41.163.31], delay 0.00000, dispersion 64.00000 transmitted 4, in filter 4 reference time: 00000000.00000000 Thu, Feb 7 2036 1:28:16.000 originate timestamp: 00000000.00000000 Thu, Feb 7 2036 1:28:16.000 transmit timestamp: d52e6306.afcfee21 Fri, May 3 2013 12:23:34.686 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 server 18.85.44.118, port 123 stratum 0, precision 0, leap 00, trust 000 refid [18.85.44.118], delay 0.00000, dispersion 64.00000 transmitted 4, in filter 4 reference time: 00000000.00000000 Thu, Feb 7 2036 1:28:16.000 originate timestamp: 00000000.00000000 Thu, Feb 7 2036 1:28:16.000 transmit timestamp: d52e6306.e3031a51 Fri, May 3 2013 12:23:34.886 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 server 65.182.144.36, port 123 stratum 0, precision 0, leap 00, trust 000 refid [65.182.144.36], delay 0.00000, dispersion 64.00000 transmitted 4, in filter 4 reference time: 00000000.00000000 Thu, Feb 7 2036 1:28:16.000 originate timestamp: 00000000.00000000 Thu, Feb 7 2036 1:28:16.000 transmit timestamp: d52e6307.16364db7 Fri, May 3 2013 12:23:35.086 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 3 May 12:23:36 ntpdate[3912]: no server suitable for synchronization found
-
nomizzz about 11 yearsAh yes. Iptables was setup correctly but I forgot the corporate firewall wouldn't be as forgiving. Thanks!