When I inspected his setting on NTP server and client(BMC), then I found he had made a mistake.
he used a Windows 2012 R2 server as the NTP server.
In Huawei iBMC user guide, it clearly described that BMC only support synchronization time with Linux NTP server.
![[Sharing] Configure NTP synchronization on BMC.-2720605-1](https://forum.huawei.com/enterprise/en/data/attachment/forum/201808/10/223857g3119537xezznhn9.png)
Link of document: http://support.huawei.com/enterprise/en/doc/EDOC1100019358?section=j011&topicName=network
if you also plan to configure ntp synchronization on bmc, pls be sure you have deploy a Linux NTP server.