Magento 2 Unable to proceed: the maintenance mode is enabled

When i visit a Magento 2 site, i get error

1 exception(s):
Exception #0 (Exception): Unable to proceed: the maintenance mode is enabled. 

Exception #0 (Exception): Unable to proceed: the maintenance mode is enabled. 
#1 Magento\Framework\App\Bootstrap->run(&Magento\Framework\App\Http\Interceptor#000000003459ecdd0000000028ca744b#) called at [index.php:39]


To fix this, login to the server using SSH, run following command.
php bin/magento maintenance:disable

This will disable Magento 2 maintenance mode. 
If you need maintenance mode enabled, you can run
php bin/magento maintenance:enable 

See Magento