Dec 24, 2016. 123.456.678 # server ip RewriteCond %{REMOTE_ADDR} !. [R=503,L] </ IfModule> # serve custom 503 response ErrorDocument 503 /maintenance.html # alternate response without custom page. Then, with that code in place, your server is going to respond with the file, maintenance.html , if it exists. HTTP Status Code 503: The server is currently unable to handle the request due to a temporary overload or scheduled maintenance, which will…