This command will clear the dns Cache in Windows XP/Vista/7.
The dns cache will be cleared of all entries including saved negative ones which can help you to find out if a server is really not responding or a valid entry and gets rid of invalid server not found errors.
Frequent web connection problems can be traced to a corrupted DNS cache. Flushing this cache is an easy fix to many of these problems. This is how to flush the cache in Xp/Vista/7:
1. Click the Microsoft Start logo in the bottom left corner of the screen
2. Click All Programs
3. Click Accessories
4. RIGHT-click on Command Prompt
5. Select Run As Administrator
6. In the command window type the following and then hit enter: ipconfig /flushdns
Windows XP/Vista/7 will echo the following statement on a successful dns flush.
"Windows IP Configuration"
"Successfully flushed the DNS Resolver Cache."
Close the command window your cashe is now refreshed.
Note: Close any open browser windows before preforming this command.
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