1. PC time, SQL time, GK time and RM time all are normal.
2. We check Radius.xml file, and it is same as before.
3. We check the tracert file, we found this file is created at 26th:
At the same day, afternoon another SDR was created, but its name was 27th. I ask R&D and they tell me this:
When system find tmp file, system will create the next day SDR, for ensure no duplicate SDR. So if we delete today's SDR, the SDR will not create again, unless we delete the tmp file.
4. We try to refresh the VBill software, and the problem was solved.