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NTP Time Synchronization with ACE-GTW-4G
NTP (Network Time Protocol) is an Internet protocol used to synchronise clocks, machines and other IT equipment on different systems across an IP network.
Time synchronisation is important in order to obtain consistent data, but especially when using an SSL certificate. If the time difference between the client and SSL server is too great, the connection will be refused.
About Time Synchronization
You can use these IP address as NTP server candidates
Or leave the default values if you have a DNS IP configured:
|
Force Time Synchronization
To force the time synchronization every month at 02:00 AM on day 1 of the month, you can add this:
In System > Scheduled Tasks, paste this line:
Every day at midnight
Then, save and restart the gateway |
Examples of time specification
min 0-59 |
hour 0-23 |
day/m 1-31 |
month 1-12 |
day/w* 0-6 |
Cron | Description |
---|---|---|---|---|---|---|
*/5 | * | * | * | * | */5 * * * * |
Every 5 minutes |
12 | */3 | * | * | * | 12 */3 * * * |
Every 3 hours at 12 minutes |
57 | 11 | 15 | 1,6,12 | * | 57 11 15 1,6,12 * |
At 11:57 Hrs on 15th of Jan, June & Dec |
25 | 6 | * | * | 1-5 | 25 6 * * 1-5 |
At 6:25 AM every weekday (Mon-Fri) |
0 | 0 | 4,12,26 | * | * | 0 0 4,12,26 * * |
At midnight on 4th, 12th and 26th of every month |
5,10 | 9,14 | 10 | * | 0,4 | 5,10 9,14 10 * 0,4 |
At 9:05AM, 9:10AM, 2:05PM and 2:10PM every Sunday and Thursday |
* 0 (zero) = Sunday
Cron | Description |
0 0 1 1 * |
Every year at midnight on day 1 of the month, only in January |
0 0 1 * * |
Every month at midnight on day 1 of the month |
0 0 * * 0 |
Every week at midnight on Sunday |
0 0 * * * |
Every day at midnight |
0 * * * * |
Every hour |
You can test your Cron here: https://crontab.cronhub.io/
Note: Don’t make the cron job for restart at the same time as the cron job for NTP synchronisation