Proxy server could not handle the request GET/POST message
Proxy Error The proxy server received an invalid response from an upstream server. The proxy server could not handle the request POST ... Reason: Error reading from remote server
Usually you can see this error message on the websites hosted with overselling hosting providers. Their servers are always overloaded by a huge number of websites, so that they just stop responding to user's browser requests.
Solutions:
- A. Switch to a decent hosting provider like 2by2host.com
- B. Move to a fully managed hosting package, like managed shared hosting at 2by2host.com