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I have a website hosted by an external webhosting company.
Sometimes, when I am uploading a file, suddenly my webbrowser says the page cannot be found. But a minute ago, it could!
What are possible reasons for that? Does it have something to do with DNS?
By the way, it’s about a subdomain: http://subdomain.example.com.
(PS: If this question is is offtopic, on what StackExchange website should I post it instead?)
Usually a subdomain is domain on its own so
sub.example.comis passed to the DNS first, if no specific record is found for this subdomain, the request is passed to the IP of the top domain (example.com). On that server the request is made again and the server will act accordingly.Therefore, I assume your current ISP does not resolve the subdomain, and the top domain is passed the same request, and as servers on their own tend to be a little less reliable than DNS servers from, say, your ISP or Google’s DNS, or OpenDNS, I assume it’s just a small glitch because of slightly worse configuring or not fully optimized routing hard- and software. I’d only worry if it happens often.
PS: Yes, this question belongs, I think, on either SuperUser or ServerFault