I am getting below error descriptions when checking the site at pingdom tools. Can someone explain the possible cause behind this error and how to resolve it?
Response Headers 503
Server: Apache
Connection: Close
X-Powered-By: PHP/5.4.45
Transfer-Encoding: chunked
Retry-After: 86400
Content-Type: text/html; charset=UTF-8
Request Headers
Pragma: no-cache
Accept-Encoding: gzip, deflate, sdch
Host: www.dummyname.com
Accept-Language: en-US,en;q=0.8
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Cache-Control: no-cache
Connection: keep-alive
Every errors 5xx are server-side, that means there is nothing much you can do for fix it.
If you take a look at the error codes messages you can check this:
503 Service Unavailable The server is currently unavailable (because it is overloaded or down for maintenance). Generally, this is a temporary state.[63]
pingdom is a big server, so surely it has several servers working on, the one your computer just used seems down, keep retrying may help