The error 503 means that the server is not available at the instant. The Magento 2 store owners may face the Magento 2 Service Temporarily Unavailable error during the installation of store or server.

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It may happen because the server is under the maintenance mode or is simply busy. The store won’t be available at all when there is an error 503.

Get the solution for the same at Solved: Magento 2 Service Temporarily Unavailable (Error 503)

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