This video tutorial is about "How to clear your DNS cache | HTML 404 error | How to Flush and Reset the DNS Cache".
Your DNS cache stores the locations (IP addresses) of web servers that contain web pages which you have recently viewed. If the location of the web server changes before the entry in your DNS cache updates, you can no longer access the site.
If you encounter a large number of HTML 404 error codes, you may need to clear your DNS cache. After you clear your DNS cache, your computer will query nameservers for the new DNS information.
To clear your DNS cache, perform the following steps:
1. Click Start.
2. On the Start menu, click Run....
3. If you do not see the Run command in Vista, enter run in the Search bar.
4. Run the following command in the Run text box:
ipconfig /flushdns
If the command succeeds, the system returns the following message:
Successfully flushed the DNS Resolver Cache.