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server not found

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I access the subdomain before the subdomain is created, and the result server is not found. why when the subdomain has been created, the page is still server not found? when the cache and cookies have been cleared

I access the subdomain before the subdomain is created, and the result server is not found. why when the subdomain has been created, the page is still server not found? when the cache and cookies have been cleared

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There could be some caching of DNS queries, but usually that isn't for a long time.

Can you access the host in another browser on your system?

Can you see it using a web-based utility (independent of your computer's address resolution) such as: http://www.kloth.net/services/dig.php ?