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When I try to synchronize time using NTP. Using the below command

sudo ntpdate -b pool.ntp.org

I get this error saying NTP socket is in use. How to fix this?

18 Jan 05:53:49 ntpdate[21340]: the NTP socket is in use, exiting
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2 Answers 2

the NTP socket is in use, exiting

Indicates that you have an NTP daemon running, usually the one via the ntp package. You can't have two applications adjusting the clock at the same time.

  1. First stop the current NTP daemon running:

    sudo service ntp stop
    
  2. Run your ntpdate command.

  3. Start the NTP daemon again:

    sudo service ntp start
    

Background

The NTP daemon will not take large steps forwards or backwards, but is useful for very smooth and small transitions. Before it will work correctly, sync the time using ntpdate first, for that reason. You can query the status of the daemon like this:

ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*chime1.surfnet. 194.171.167.130  2 u   59   64    7    3.159   -0.207   0.136
+chime2.surfnet. .GPS.            1 u   59   64    7    6.872   -0.592   0.091
[...]
 ns1.tudelft.nl  .INIT.          16 u    -   64    0    0.000    0.000   0.000
+ev001.tilaa.nl  193.67.79.202    2 u   55   64    7    4.038   -0.613   0.110
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Ubuntu ships openntpd and not xnptd as a default? ntpq is from xntpd. –  Martin Schröder Jan 18 '13 at 10:23
    
@MartinSchröder You're right! :) Editing now. Thanks. –  gertvdijk Jan 18 '13 at 10:44
    
Correction: ntpq is from the ntp reference implementation. In the 90s and early 00s it was called xntpd, it is now just ntpd or ntpv4. –  dfc Jan 19 at 17:02

If you get the Error NTP socket in use as shown below:

enter image description here

In that case just run

$ sudo ntpdate pool.ntp.org
$ sudo service ntp stop
$ sudo ntpdate pool.ntp.org
$ sudo service ntp start

and you will get

enter image description here

OR JUST RUN

sudo ntpdate -u pool.ntp.org

to update with the ntpd deamon running

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1  
Dont encourage people to run ntpdate when ntpd is running –  dfc Mar 5 at 14:29

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