On Wed, Jun 20, 2018 at 04:50:34PM +0300, David Baron wrote:
> Attached ntp.conf
> Attached service.text
>
OK, so your NTP servers are:
pool 0.debian.pool.ntp.org iburst
pool 1.debian.pool.ntp.org iburst
pool 2.debian.pool.ntp.org iburst
pool 3.debian.pool.ntp.org iburst
What happens if you do:
ping 0.debian.pool.ntp.org
?
Most likely you are blocking UDP/123. However, if you fail to resolve
the IP when you ping it, you have a DNS issue.
Mike.