Invalid response from http://sitebuilt.net/.well-known/acme-challenge/

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7 
	location /.well-known/acme-challenge {
		default_type text/plain;
		root /etc/letsencrypt/webroot;
  	}

Try creating text file:
/etc/letsencrypt/webroot/test1
And see if that can be reached via:
http://sitebuilt.net/.well-known/acme-challenge/test1

If that fails, create text file:
/etc/letsencrypt/webroot/.well-known/acme-challenge/test2
And see if that can be reached via:
http://sitebuilt.net/.well-known/acme-challenge/test2

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