Service Temporarily Unavailable in Magento

When Magento performs certain tasks like extension installation from Magento Connect it temporarily creates a file called maintenance.flag. Magento checks for its existence and if it’s there will send users to the page you described . It’s supposed to automatically delete this file when done processing whatever task it was doing, but I’ve experienced occasions where something went wrong and it failed to delete it and admin person need to delete it manually from FTP or Control Panel.

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