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NTP Server Online Tester
This tool is useful to check if a given
rotocol server is reachable over the internet using IPv4 and IPv6 connectivity.
It is also useful for knowing the resulting offset using the exact time of
stratum 2 NTP public server.
to perform a time synchronization query which works for linux servers, windows servers, etc.
This website IPv4 and IPv6 addresses are 2a02:c207:1:3259:1::1 and 220.127.116.11
The following tasks may help you pass this server test in case of trouble:
Verify that your server and NTP service are up and running.
Verify that the time sources of your server are working well.
Verify that your server UDP 123 port is publicly accessible.
Recommended for linux server admins and linux users:
How to join your linux server to the NTP pool project
How to query and test an NTP server using ntpdate