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If you cannot access the system, pelase clear your DNS cache.
To clear your DNS cache if you use Windows, perform the following steps:
Click Start.
Enter cmd in the Start menu search text box.
Right-click Command Prompt and select Run as Administrator.
Run the following command : ipconfig /flushdns.
If the command succeeds, the system returns the following message:
Windows IP configuration successfully flushed the DNS Resolver Cache.