# NTP Sync not Syncing? **URL:** \ **Category:** Product support\ **Created:** [September 17, 2017, 12:16pm UTC](https://forums.balena.io/t/ntp-sync-not-syncing/1851 "2017-09-17T12:16:17Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![kumerachips](https://avatars.discourse-cdn.com/v4/letter/k/cab0a1/32.png) [@kumerachips](https://forums.balena.io/u/kumerachips)\ **Post date:** [September 17, 2017, 12:16pm UTC](https://forums.balena.io/t/ntp-sync-not-syncing/1851/1 "2017-09-17T12:16:17Z")
Hi All, I’m having a little difficulty with time sync. I realize it occurs in the host OS [https://docs.resin.io/runtime/time/](https://docs.resin.io/runtime/time/), but even though I’m setting the timezone (my application needs correct local time), the OS clock isn’t syncing. I’ve tried the dbus-send to systemd, that just confirms that it hasn’t sync’d. The time on the device log files is a weird portion of an hour out of sync, not a nice multiple of hours as I would see with a simple TZ error. Is there a way to see what problems the host OS is having with Sync? Specifics: Raspberry Pi Zero W Pimoroni InkyPhat card ResinOS: Resin OS 2.2.0+rev1 Local Wifi NATd, and connecting fine to [Resin.IO](http://Resin.IO) dashboard. Docker image: resin/rpi-raspbian ---
**Author:** ![willnewton](https://avatars.discourse-cdn.com/v4/letter/w/e9c0ed/32.png) [@willnewton](https://forums.balena.io/u/willnewton)\ **Post date:** [September 19, 2017, 6:46am UTC](https://forums.balena.io/t/ntp-sync-not-syncing/1851/3 "2017-09-19T06:46:00Z")
Typically this issue is caused by problems accessing NTP servers on UDP port 123. Is this port being blocked by your firewall? ---
**Author:** ![kumerachips](https://avatars.discourse-cdn.com/v4/letter/k/cab0a1/32.png) [@kumerachips](https://forums.balena.io/u/kumerachips)\ **Post date:** [September 20, 2017, 3:11am UTC](https://forums.balena.io/t/ntp-sync-not-syncing/1851/4 "2017-09-20T03:11:42Z")
No, other Windows 10 PC and Ubuntu VM’s update ok. [`[https://www.cs.cmu.edu/~help/networking/ntp.html](https://www.cs.cmu.edu/~help/networking/ntp.html)`]. **edit.** Installed ntpdate in the container and it runs and syncs fine from the terminal. ``` root@b92e483:/app# ntpdate time1.google.com 20 Sep 23:50:24 ntpdate[313]: step time server 216.239.35.0 offset 4684686.221160 sec root@b92e483:/app# ntpdate time1.google.com 20 Sep 23:50:39 ntpdate[314]: adjust time server 216.239.35.0 offset 0.001058 sec root@b92e483:/app# ``` ---
**Author:** ![willnewton](https://avatars.discourse-cdn.com/v4/letter/w/e9c0ed/32.png) [@willnewton](https://forums.balena.io/u/willnewton)\ **Post date:** [September 20, 2017, 12:11pm UTC](https://forums.balena.io/t/ntp-sync-not-syncing/1851/5 "2017-09-20T12:11:02Z")
By default resinOS uses e.g. [0.resinio.pool.ntp.org](http://0.resinio.pool.ntp.org) can you successfully synchronize to that server? ---
**Author:** ![kumerachips](https://avatars.discourse-cdn.com/v4/letter/k/cab0a1/32.png) [@kumerachips](https://forums.balena.io/u/kumerachips)\ **Post date:** [September 20, 2017, 8:54pm UTC](https://forums.balena.io/t/ntp-sync-not-syncing/1851/6 "2017-09-20T20:54:27Z")
Yes, it syncs with that server using ntpdate, just doesn’t work at start. Interestingly, the local time inside the container is set, but cron remains in UTC. **EDIT:** Some more useful info here: [Tricks and Traps, Cron in containers](http://dev.im-bot.com/docker-cron/)