HTTP error code 503 means that the requested service to the WEB server is not available, Apache usually presents such error when it can not fulfill the request in question, several reasons may be the following:
- Excessive requests to the server, which becomes unstable.
- Internal error generated by some erroneous configuration.
- Lack of resources available on the server to fulfill the request.
- Among others.
To find such errors, apache provides two places to look for errors, ErrorLog and AccessLog , in a default apache configuration, these logs can be found in
If you are working with more than one virtual host in your installation, they may or may not be being written to different locations.
To write the site.com virtual host logs for example, add the following lines to the corresponding
CustomLog /meu/caminho/onde/quero/salvar/os/logs/site.com.log combined
and then the files
site.com.error.log will contain the access and error logs respectively.