Certbot mode standalone " Failed authorization procedure. www.mamediarrahbeye.ovh (http-01): urn:ietf:params:acme:error:unauthorized :: The client lacks sufficient authorization :: The key authorization file from the server did not match this challenge"

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If I access http://mamediarrahbeye.ovh/ in a browser, I get an OVH "site en construction" page.

Is 188.165.53.185 your server's IP address? Where does that page come from? Do you have some kind of OVH load balancer or CDN or proxy service in front of your site?

Whatever the server is, it's handling the validation requests instead of forwarding them to your Certbot server.

I think this is known to happen with OVH, but I don't remember the details. :confused:

Edit: See this thread:

It's very old and I don't know how accurate it still is.