The Web server (running the Web site) is currently unable to
handle the HTTP request due to a temporary overloading or
maintenance of the server. The implication is that this is a
temporary condition which will be alleviated after some delay.
Some servers in this state may also simply refuse the socket
connection, in which case a different error may be generated
because the socket creation timed out.
Any client (e.g. your Web browse) goes
through the following cycle when it communicates with the Web
- Obtain an IP address from the IP name of the site (the site
URL without the leading 'http://'). This lookup (conversion of
IP name to IP address) is provided by domain name servers
- Open an IP socket connection to that IP address.
- Write an HTTP data stream through that socket.
- Receive an HTTP data stream back from the Web server in
response. This data stream contains status codes whose values
are determined by the HTTP protocol. Parse this data stream for
status codes and other useful information.
This error occurs in the final step above when the client
receives an HTTP status code that it recognizes as '503'.
Basically, the Web server is effectively 'closed for repair'. It is still
functioning minimally because it can at least respond with a 503
status code, but full service is impossible i.e. the Web site is
simply unavailable. There are a myriad possible reasons for this,
but generally it is because of some human intervention by the
operators of the Web server machine. You can usually expect that
someone is working on the problem, and normal service will resume
as soon as possible.
You can also contact the system operators of the Web site (e.g. your
ISP) to determine why the service is down. They will be in a much
better position to help you than I am for this type of error.
Sorry so long winded:)
Hope this helps!
And please rate