In such cases try waiting for a couple of hours and clearing your browser cache. It has worked for me. So most probably if you clear your browser cache, you will also be able to open your domain without getting redirected to this mysterious /cgi-sys/defaultwebpage.cgi page.
If clearing the browser cache doesn’t work or your customers too complain of this issue and you can’t make them clear their browser caches, then you might need a more advanced fix from the server side. Please call Hosting cu
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