A. By default, Windows stores positive responses in the DNS cache for 86,400 seconds (i.e., 1 day) and stores negative responses for 300 seconds (5 minutes). To modify these values, perform the following steps:
- Start a registry editor (e.g., regedit.exe).
- Navigate to the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dnscache\Parameters registry subkey.
- From the Edit menu, select New, DWORD Value.
- Enter the name MaxCacheEntryTtlLimit to change the positive cache period or the name NegativeCacheTime to change the negative cache period, then press Enter.
- Double-click the new value, set it to the desired number of seconds (e.g., if you entered the name NegativeCacheTime, you could set the value to 0 to stop Windows from caching any negative responses), then click OK.
- Repeat step 5 for the other value, if required.
- Close the registry editor.
- Reboot the computer for the changes to take effect.
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