Microsoft anti-virus software Microsoft Security essentias cannot be updated

The MSE icon suddenly went red the day before yesterday. I went in and updated it and found that it was not the first time. Uninstalling it, And then downloading and installing it on the official website. The result is still not updated, including enteringUpdate the mpcmdrun-signatureupdate command. No updates are required. I went here. The system is not completely protected because it is not red after the reinstallation, but yellow.

When I was puzzled, my eyes caught a prompt and I found that my last update was March 9...

I went to check the system time, and it turned into October. After I changed it, I updated it again. Which of the following is why Microsoft's software was too stupid? He still reported that the last update time was October 3, no updates required!

Unmount and reinstall again. Everything is back to normal!

But I thought for a moment and thought, why does the system time change? When I modified the settings, I found that the default intternet time synchronization website failed. Finally, I switched to Microsoft time synchronization domain name for synchronization, is there a problem with the default time synchronization website? Or is there a problem with my domain name resolution? In short, there are many possibilities. The problem is also solved. Do not think more for the moment.