Do you want to make your site temporary offline like coming soon and maintenance mode? This extension will help you with simple plug & play to your TYPO3 instance.
TYPO3 Backend Live Demo: https://demo.t3planet.com/live-typo3/t3t-extensions/typo3/?TYPO3_AUTOLOGIN_USER=editor-maintenance
Front End Demo: https://demo.t3planet.com/t3t-extensions/maintenance
To make any domain-related changes or whitelist any development and staging domains, please reach our support center.- https://t3planet.com/support