Are you asking why the website of the Open University of China can't be opened? In this case, the web page cannot be opened for the following reasons:

1. If you need to check whether your network connection is normal, you can try to open other webpages or use other devices to connect to the network to see if you can access the webpage of The Open University of China normally.

2. Sometimes the browser cache will cause the webpage to fail to load normally. You can try to clear the browser cache and then visit the webpage of the Open University of China again.

3. Sometimes the website of the National Open University is maintained. It may be temporarily inaccessible at this time, and you can try to access it later.