An error occurs when upgrading PHP

Hi, I was creating a local site with PHP version 5.6.39, but when I changed the version to 7.3.5, I got an error in the site health.

The following is the error content

The REST API request failed due to an error.
error:cURL error 28: Operation timed out after 10000 milliseconds with 0 bytes received (http_request_failed)

The loopback request to the site failed. Currently, the dependent features are not working as expected.
error:cURL error 28: Operation timed out after 10000 milliseconds with 0 bytes received (http_request_failed)

The solutions I have tried are:

・Check memory capacity (was 256M)
・Timeout value change(300→3000)
・Stop all plugins
・Change theme

I couldn’t solve it this way.
Could you please tell me what to do

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