I tried to reach the site he built few times today and it was down every time I tried to open it. Ouch. Proxy Error The proxy server received an invalid respo

I tried to reach the site he built few times today and it was down every time I tried to open it. Ouch. Proxy Error The proxy server received an invalid response from an upstream server. The proxy server could not handle the request GET /. Reason: Error reading from remote server