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I have this issue on my PROD server and I can’t find the cause, the message in the box says:
Loopback requests are used to run scheduled events, and are also used by the built-in editors for themes and plugins to verify code stability.
The loopback request returned an unexpected http status code, 401, it was not possible to determine if this will prevent features from working as expected.
After some research it seems that the issue is caused by PHP curl not being able to do a request to localhost. I tried adding the code from [here]) to functions.php, but it does nothing. Any ideas what might be causing this? Or where to start searching for the cause?
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Is cURL installed on the server? That’s first.