Suddenly an unexpected error occurs on a wordpress site and cannot be resolved

What is the name of the domain?

shisan.one

What is the issue you’re encountering

An unexpected error has suddenly occurred on a wordpress site and cannot be resolved.

What steps have you taken to resolve the issue?

none

What are the steps to reproduce the issue?

An unexpected error has suddenly occurred on a wordpress site and cannot be resolved.

We asked the server to investigate and they responded that there was no problem here and that it is probably affected by going through Cloudflare.

The site in question has suspended Cloudflare and intends to use it only as a DNS.

[Details of the problem happening].
This is occurring on the Add New Plug-in page and the following is no longer possible.
Searching for and adding plugins on the admin screen.
Re-installing wordpress on the admin screen.

When debug mode is enabled, the following error is displayed.

[Add new plugin screen].
Warning: plugins_api(): an unexpected error occurred, there may be something wrong with WordPress.org or this server configuration. If the problem persists, If the problem persists, see the support forum. (WordPress could not establish a secure connection with WordPress.org. Please contact your server administrator)
wp-includes/functions.php 6114

[Error when reinstalling WordPress].
Download failed. : cURL Error 6: Failed to start getaddrinfo() thread.
Installation failed.
Warning: plugins_api(): an unexpected error occurred, there may be something wrong with WordPress.org or this server configuration. If the problem persists, Please refer to the support forum. (WordPress could not establish a secure connection with WordPress.org. Please contact your server administrator)
wp-includes/functions.php 6114

If anyone knows the cause or solution, we would be grateful if you could enlighten us.

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