Loopback request on port 80

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On a website (that runs only on port 80) behind a nginx proxy I see this error in the site health report:
`Failed to connect to website:443, connection refused.`

I understand that this is because the server that runs WordPress only responds to port 80. Is there a way to force the loopback request to work on port 80? Also I’m running the cron.php manually with a cronjob, so in this case do I need the loopback request?

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