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I've been finding that my device recently has been unable to connect to ntp.ubuntu.com with its systemd-timesyncd service.

Mar 15 00:31:52 l157 systemd-timesyncd[673]: Timed out waiting for reply from 91.189.89.199:123 (ntp.ubuntu.com).
Mar 15 00:32:02 l157 systemd-timesyncd[673]: Timed out waiting for reply from 91.189.89.198:123 (ntp.ubuntu.com).
Mar 15 00:32:12 l157 systemd-timesyncd[673]: Timed out waiting for reply from 91.189.91.157:123 (ntp.ubuntu.com).
Mar 15 00:32:23 l157 systemd-timesyncd[673]: Timed out waiting for reply from 91.189.94.4:123 (ntp.ubuntu.com).

Is ntp.ubuntu.com a viable NTP site to use for this or should I be using another NTP site?

Mikolasan
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Douglas Burrell
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  • I'm sure there are logs somewhere displaying errors, post them – j-money Mar 14 '19 at 14:40
  • Mar 15 00:31:52 l157 systemd-timesyncd[673]: Timed out waiting for reply from 91.189.89.199:123 (ntp.ubuntu.com). Mar 15 00:32:02 l157 systemd-timesyncd[673]: Timed out waiting for reply from 91.189.89.198:123 (ntp.ubuntu.com). Mar 15 00:32:12 l157 systemd-timesyncd[673]: Timed out waiting for reply from 91.189.91.157:123 (ntp.ubuntu.com). Mar 15 00:32:23 l157 systemd-timesyncd[673]: Timed out waiting for reply from 91.189.94.4:123 (ntp.ubuntu.com). – Douglas Burrell Mar 15 '19 at 15:02
  • Post them in your original question using the edit button and make sure you format it properly, use the help button if need be – j-money Mar 16 '19 at 18:11
  • Your log messages indicate that your system is unable to contact the Ubuntu NTP servers. Millions of other systems can contact them successfully, so check that you don't have a firewall interfering. It might be a firewall rule on your local system, or it might be a router further upstream, possibly even in your ISP if you're unlucky. – Paul Gear May 15 '19 at 09:20

1 Answers1

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I had the same problem when connecting to the internet via eduroam. The problem goes away when connecting via another network. It seems that the eduroam administrators are just a bit too careful with their firewall configuration or something like that.

As long as you occasionally connect to a network other than eduroam it shouldn't be a problem and your time should always stay in sync.

user313032
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  • I can confirm this happens to me. In my office network I can't sync, but I share my cellphone data with my laptop and, bang, it syncs immediately... thus suggesting is something with my ISP (or my router config but those I haven't touched in a while, so most likely my ISP). I have both 18.04 and 20.04 devices – DarkCygnus Oct 11 '22 at 21:21