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DNS (Domain Name System) caching is used to resolve hostnames for faster access. The problem with this feature is that failed DNS lookups also get cached.
To change so that it will not cache failed DNS lookups...
Step 1: Flush the DNS cache manually
Go to the Command Prompt
Enter ipconfig /flushdns
Step 2: To permanently solve, modifing the Registry
Click Start
Click Run
Enter regedit
Click OK
Go to
HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Services > Dnscache >Parameters
Change following Parameters the the values as given bellow:
NegativeCacheTime=0 (DWORD default=300 seconds)
NetFailureCacheTime=0 (DWORD default=30 seconds)
NegativeSOACacheTime=0 (DWORD default=120 seconds)
Step 3: Restart Computer
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