Re: 1.'Proxy Error The proxy server received an invalid response from an upstream server.The proxy server could not handle the request '.2. Bad Gateway

Generally, when a user-agent reports "Bad Gateway", this is because the user-agent received a 502 HTTP response. Are you seeing this error when you attempt to access the BIG-IP WebUI, when you attempt to access iControl, or from a web application through a BIG-IP Virtual Server?