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Hello and welcome to justanswer. My name is***** will be assisting you today. I am sorry to hear that you are having such trouble.
Ca you please tell me what operating system you are using?
You can flush your dns
Open command prompt with admin rights and type in the following
ipconfig /flushdns and hit enter
ipconfig /registerdns and hit enter
Now test agian - if it still fails we need to check your dns settings.