SES time sync error

skmvasu asked:

My SES setup was running fine for the last 6 months without any issues. All of a sudden it stopped working yesterday and I’m gettinng the infamous time sync error.

Naturally I assumed ntpd had stopped, but to my surprise when I checked the process tree, I noticed that it was running.

 ~  ps auwx | grep ntpd                                 
ntp      18223  0.0  0.0  33600  2132 ?        Ss   07:05   0:00 /usr/sbin/ntpd -p /var/run/ -g -u 106:112
ubuntu   19127  0.0  0.0   8144   668 pts/5    S+   07:19   0:00 grep ntpd

Then I tried ntpdate which said

2 Sep 07:16:09 ntpdate[18966]: no servers can be used, exiting

I checked the /etc/ntp.conf file which had the default ubuntu servers listed by default.

# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help

driftfile /var/lib/ntp/ntp.drift

# Enable this if you want statistics to be logged.
#statsdir /var/log/ntpstats/

statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable

# Specify one or more NTP servers.

# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
# on 2011-02-08 (LP: #104525). See for
# more information.

# Use Ubuntu's ntp server as a fallback.

# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
# details.  The web page <>
# might also be helpful.
# Note that "restrict" applies to both servers and clients, so a configuration
# that might be intended to block requests from certain clients could also end
# up blocking replies from your own upstream servers.

# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery
restrict -6 default kod notrap nomodify nopeer noquery

# Local users may interrogate the ntp server more closely.
restrict ::1

# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
#restrict mask notrust

# If you want to provide time to your local subnet, change the next line.
# (Again, the address is an example only.)

# If you want to listen to time broadcasts on your local subnet, de-comment the
# next lines.  Please do this only if you trust everybody on the network!
#disable auth

I couldn’t spot the issue here. Then I tried to check the status of NTP server and found no issues there.

/etc/init.d/ntp status                             
 * NTP server is running

I also tried adding a NTP server manually to see if it worked, but that didn’t help either

 sudo ntpdate                         
 2 Sep 07:20:08 ntpdate[19203]: the NTP socket is in use, exiting

I really don’t understand what the issue is here. Why is ntpd not working when it’s running in the background?

Any help would be appreciated. Thanks.

My answer:

You need to stop ntpd before running ntpdate.

sudo service ntp stop
sudo ntpdate
sudo service ntp start

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