We have a reverse proxy redirecting to many internal websites.
For all sites we have no issue but for one each I time run certbot-auto I get this error :
The following errors were reported by the server:
Domain: "mywebsite.fr" Type: unauthorized Detail: Invalid response from http://"mywebsite.fr"/.well-known/acme-challenge/joTDZKkyDRnMBMTD6YIar91hgpasWRvRG01NmeGcivQ: "<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>403 Forbidden</title> </head><body> <h1>Forbidden</h1> <p"
I can’t explain what is the problem. For me it can’t be the reverse proxy as it works for many other sites and they are all based on the same template.
The real website is an Ubuntu 16.04 with Apache2.4.18, PHP7.0 and It’s accessible from outside.
I don’t really know how works certbot auto if there is any requirement to be sure that certbot auto works.
Any help would be very appreciated.