how can I fix my dns cache?

Question

Please I need help fixing my dns? I've tryed going to run in my computer and puting ipconfig/flushdns and it wont do it it says dns cache failed and i've tryed it many times. HELP!!!!

Answer 1

I've never heard of ipconfig /flushdns failing. You may have a corrupt .dll file. On an XP machine, your DNS cache is probably going to be contained in the dnsrslvr.dll, located in your windows/system32 directory. I would copy a known good file from another XP machine, then rename your file dnsrslvr.old, then paste the good .dll in its place. Then try flushing DNS again. That should solve your problem.

Answer 2

XP remembers negative (DNS unable to resolve) entries for a few minutes. Often this can be a pain when moving and debugging sites. As long as that negative entry sits in your DNS cache, your box will continue to give you a cannot find server error. By cleaning out your DNS cache, you can fix this problem.

Rebooting will flush your cache... but there is an easier way.

Drop to a command box and type:



ipconfig /flushdns (make sure you have a space between ipconfig and /)


If you wish to stop XP from placing negative entries into cache, you can make this change in your registry.

1. Goto HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ Dnscache\Parameters
2. Build a new DWORD value called NegativeCacheTime and give it a value of 0

I believe the default time is 5 minutes. I always use zero for my default time, but I think the value above is in seconds. So if you only want to save them for 1 minute, then I am assuming you would change that value to 60.