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Error 503: Service Temporarily Unavailable Magento

We can come across a situation in magento where we are presented with the following message,
"Service Temporarily Unavailable  The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later."

This happens because when Magento is performing certain tasks, it temporarily creates a file called maintenance.flag. Magento automatically deletes this file when the task is complete.
But when the task is incomplete or something wrong happen in between, then this file remains there.
Magento checks for its existence and if found redirects to error 503 page.

So, the solution is to check if the file maintenance.flag is in magento root. If it is there, then delete it.

Cheers!!

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