Keep in mind, if your IP is in the Configuration ... Website Maintenance ...
Down For Maintenance (exclude this IP-Address)
This IP Address is able to access the website while it is Down For Maintenance (like webmaster)
To enter multiple IP Addresses, separate with a comma. If you do not know your IP Address, check in the Footer of your Shop.
then you will just see the warning message and not the Down for Maintenance page so that you can still work on the site while it is down for maintenance but have the reminder to change the setting as everyone else sees the Down for Maintenance page ...