When you encounter Alibaba webpage NOTFOUND 404 error, you can try the following methods to deal with it:

1. Refresh the page: First, refresh the webpage to see if it can be displayed normally. Sometimes, the 404 error may be temporary and can be solved by refreshing the page.

2. Clear the browser cache: The browser's cached data may cause some page display problems. Please try to clear the browser cache and then visit the Alibaba website again.

3. Use other browsers: Change the browser to visit the Alibaba website, such as Google Chrome, Mozilla Firefox, etc. This can eliminate browser compatibility issues.

4. Check the network connection: Confirm that your network connection is normal and there is no malfunction. If the network is unstable, it may cause errors when accessing the website.

5. Visit other Alibaba pages: Try to visit other Alibaba pages to see if the 404 error still occurs. If other pages cannot be accessed normally, there may be problems with the Alibaba website as a whole.

6. Wait for the website to be repaired: If the above methods do not solve the problem, you need to wait for the Alibaba technical team to repair the website. In this case, you can follow Alibaba's official announcements or social media platforms to learn about the progress of the website repair.

7. Contact Alibaba customer service: If the problem persists, you can call Alibaba customer service, explain the problem phenomenon and provide relevant screenshots so that the staff can further solve the problem for you.

Please note that NOTFOUND 404 errors usually mean that the webpage does not exist or the link is wrong. When dealing with the problem, please make sure you are visiting the Alibaba official website and check whether the access link is correct.