[Samba] Time synchronization problem. Chrony, ntp

Programnet tomeks at programnet.eu
Sat Jan 18 16:27:47 UTC 2025


I solved the problem. In my case, it turned out that after updating to 
SAMBA 4.21.x from Debian Backport, the time server stopped responding to 
signed NTP queries. I changed the GPO from NT5DS to NTP. Now it's 
without signing, but at least it works.
I checked my other Samba deployments and observed the exact same effect 
everywhere.

https://wiki.samba.org/index.php/Time_Synchronisation#Setting_User_Defined_Time_Sources_and_Options

Thank you all for guiding me towards the solution.

W dniu 18.01.2025 o 09:48, Programnet via samba pisze:
> I noticed a problem with time synchronization on all Windows 
> endpoints. I am using Samba 4.21.3 and Chrony 4.3-2.
>
> When I run the following command in Windows:
>
> w32tm /monitor
> dc1.xxxx.pl *** PDC ***[192.168.45.10:123]:
> ICMP: 1ms delay
> NTP: +0.0000000s offset from dc1.xxxx.pl
> RefID: time.cloudflare.com [162.159.200.123]
> Stratum: 4
> dc2.xxxx.pl[192.168.45.9:123]:
> ICMP: 1ms delay
> NTP: -0.0001207s offset from dc1.xxxx.pl
> RefID: ntp1.orange.pl [80.50.102.114]
> Stratum: 2
>
> Warning:
> Reverse name resolution is best effort. It may not be
> correct since RefID field in time packets differs across
> NTP implementations and may not be using IP addresses.
>
> But when I run:
>
> w32tm /resync
> Sending resync command to local computer
> The computer did not resync because no time data was available.
>
> When I check on the DC servers with the |tcpdump| program, there is an 
> incoming packet, but no outgoing packet.
>
> I am sure this worked previously. It likely stopped working after 
> upgrading to Samba version 4.21.1.
>
> I configured Chrony based on the example:
> https://samba.tranquil.it/doc/en/samba_config_server/debian/server_install_ntp_debian.html 
> <https://samba.tranquil.it/doc/en/samba_config_server/debian/server_install_ntp_debian.html> 
>



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