Every boot my date and time are reset to zero, seems my ntp is not working at all. Similar problem to :
Once booted I can ping and host nvidia.com or for example:
$ host time.nist.gov
time.nist.gov is an alias for ntp1.glb.nist.gov.
ntp1.glb.nist.gov has address 184.108.40.206
ntp1.glb.nist.gov has IPv6 address 2610:20:6f15:15::27
sudo service ntp stop
sudo ntpdate -s time.nist.gov
sudo service ntp start
does not correctly set up the time. So doing the manual ntpdate does not work.
sudo ntpdate -q time.nist.gov
server 220.127.116.11, stratum 0, offset 0.000000, delay 0.00000
25 Feb 16:40:11 ntpdate: no server suitable for synchronization found
From this: http://askubuntu.com/questions/429306/ntpdate-no-server-suitable-for-synchronization-found
it seems that it could be due to the ntp port being closed, if I do:
sudo nmap -p123 -sU -P0 localhost
Starting Nmap 6.40 ( http://nmap.org ) at 2016-02-25 16:45 UTC
Nmap scan report for localhost (127.0.0.1)
Host is up (0.000068s latency).
PORT STATE SERVICE
123/udp closed ntp
but I have all ports open:
sudo iptables -S
-P INPUT ACCEPT
-P FORWARD ACCEPT
-P OUTPUT ACCEPT
and my laptop with ubuntu installed in the same network works fine.