no server suitable for synchronization found

[solidsnake]

Hello.
I get the time from a windows server with ntpadte from server A to make sure the time is the same on my servers.

I try to get the time from this server A from all my other servers.

But I can't get the time from server A. There was a server change and it stopped getting the time after that.

What should I check?

Windows server 1.1.1.200

A server (centos 7 ) --> 1.1.1.150

B server (centos 7) --> 1.1.1.120

/usr/sbin/ntpdate -u 1.1.1.200

17 Mar 16:58:35 ntpdate[2411]: adjust time server 1.1.1.200 offset 0.000837 sec

B Server

/usr/sbin/ntpdate -u  1.1.1.150
17 Mar 16:51:15 ntpdate[10965]: no server suitable for synchronization found

iptables off, firewall off on server A

 

[jpnilson]

I would suggest a packet capture. If this server is behind a firewall or packet filter and something has changed you are likely being blocked. Hard to tell without understanding the architecture

 

[GatorsFan]

and just a heads up but CentOS 7 drops dead on 30 June 2024

 

[f33dm3bits]

But I can't get the time from server A. There was a server change and it stopped getting the time after that.

Was the ntp/Windows server changed?

 

[GatorsFan]

On server A
Run sudo dpkg-reconfigure tzdata to select the correct time zone.
Afterwards, run cat /etc/timezone to check it.
Run, timedatectl status to check it

 

[f33dm3bits]

Run sudo dpkg-reconfigure tzdata to select the correct time zone.

That doesn't work on RHEL based systems, since it's a command specific to Debian based systems.

 

[GatorsFan]

That doesn't work on RHEL based systems, since it's a command specific to Debian based systems.

your right I am thinking Debian - it is probably tzselect - so disregard my post #5

Have a look here at this thread - https://serverfault.com/questions/558354/correcting-centos-system-clock