After a reboot of a DC, in the QDSPwFilter you see the following errors
2023-12-04T10:32:18.622 Error Unable to register event source 'QDSPwFilter': RegisterEventSource: error 0x000006BA (1722) 2023-12-04T10:32:18.622 Info Starting Password Copy service 2023-12-04T10:32:18.715 Info Unable to initialize SAM; retrying in 15 sec
Unable to connect to SAM: SamIConnect
error 0xc00000dc (-1073741604)
原因
This is caused by the OS trying to start listening on the Pipe too soon
解决办法
There is no need for any action as this is expected. As long as you see the following line after those errors it confirms that the pipe for syncing passwords is now listening.
2023-12-04T10:32:35.076 Info Listening on named pipe '\\.\pipe\QDSPwCopy' with security 'O:BAG:BAD:(A;;FA;;;SY)(A;;FA;;;BA)(A;;FRFW;;;WD)(A;;FRFW;;;AN)'