| 1, the time synchronization process: The client uses the default domain controller that is connected to a clock source, the domain controller from the forest will be the authoritative source synchronous clock time, if you do not specify a domain controller as the authoritative source clock, then the domain controller that holds the PDC role to play authoritative clock server. Authoritative source clock acquisition time, there are two ways, one is installed within the network hardware clock, the other is an external clock server, if you have not configured, then the PDC will use its own internal clock. 2, the query commands w32tm / query / source # query clock source 
w32tm / query / status # query time service status 
w32tm / query / configuration # query the current configuration information 
Nc tools used, see the clock source 123 of the port is open, as shown below for the open tips nc.exe -vuz 9.38.90.130 123 
3, manually clock source w32tm /config /update /manualpeerlist:9.38.90.231 /syncfromflags:manual /reliable:yes Upon completion of command need to use the command to restart the service: net stop w32tm && net start w32tm 
w32tm / resync / nowait # resynchronization clocks, ranging synchronous case, returns the result directly 
4, the corresponding registry 路径：HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\W32Time\Parameters 
Type Description: Nosync: means that the client does not synchronize time NTP: that the client synchronize time from an external time source, and this time NTPServer field defines the source NT5DS: means that the client is configured to use a domain architecture as their time synchronization AllSync: The client indicates any reliable synchronization time from the time at the source, and the domain structure comprising an external time source. Note: The default value on the domain controller is NT5DS, on a standalone client or server is NTP. 5, Debug Logging 开启debug：w32tm /debug /enable /file:c:\w32time.log /size:10000000 /entries:300 （生成的debug日志在c:\w32time.log，循环日志记录的最大值为10M，记录的类型范围是0-300，300表示记录所有信息。） 关闭debug：w32tm /debug /disable （关闭debug日志记录功能） |