I really rely on the search function before I post a question to get some back ground but lately I am seeing this message when I preform a search;

Gateway Time-out
The gateway did not receive a timely response from the upstream server or application.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Is there something I need to alter on my end? Any advise would be welcome. Thanks in advance.