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503 usually means that the Web server is currently unable to handle the HTTP request due to a temporary problem such as overloading or maintenance on the server.

This error may also be due to an issue on your site which will require additional review by your web host. Please contact your web host for further assistance.

Caching

If your site is receiving a large volume of traffic consider using a cache mechanism or server static html pages instead of your dynamic content.

• Wp-Super Cache
• W3-Total Cache
• Any Built-in Cache Mechanism your platform provides

Site Optimization

If you must continue to server dynamic content ensure that your platform is as optimized as possible so that it does not place an unnecessary load on the server.

• Use local resources instead of remote ones
• Use relative link structures
• Minimize the number of rules in your override file(s) (.htaccess)
• Ensure that your database is optimized
• Empty stale or expired caches
• Disable any site related plug-ins that you are not using

Hotlinking

Avoid hotlinking to resources on the server that are stored deep in your sites architecture or hotlinking to resources that you do not own. Consider protecting these resources with IP Deny rules