While surfing the web, you may find that the browser can't connect to the DNS server .you may try to repair the internet connection by clicking "repair" in the menu of the connection icon, but what will you do if windows give you this message "unable to clear DNS cache"? Just do the following steps:
1. From the start menu, click on "Run" and type "cmd" then press open.
2. In the command box type "ipconfig/flushdns".
3. If this failed to fix the problem and Windows couldn't clear DNS cache, open "run" from start menu and type "services.msc" and click open.
4. Look for "DNS Client" and click on it, then make this service start automatic.
5. Try to repair the connection again or do the same thing in steps 1&2. Source: http://inanotechnology.blogspot.com/2008/09/5-steps-to-clear-windows-dns-cache.html
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