Seeing a ‘Site Currently Unavailable’ message can be frustrating, but you can...

https://wiki-tonic.win/index.php/Site_Currently_Unavailable_-_How_to_Set_Up_Backups_So_Restore_Is_Easy

Seeing a ‘Site Currently Unavailable’ message can be frustrating, but you can fix it. First, check your site’s DNS settings to ensure they’re correct. If everything looks fine, review your folder and file permissions to rule out 403 errors