How to solve maintenance down time or capacity Errors ?

Error

Service Temporarily Unavailable in Magento 1

You should check if there is a file maintenance.flag in the Magento root folder.

Solution

Delete the file maintenance.flag in Magento root folder.

Service Temporarily Unavailable in Magento 2

• Delete a file called var/.maintenance.flag in the Magento root folder
• Remove Magento cache if there is any: php bin/magento cache:flush