hello till, hello all, first of all, thanks for your great development and support of ispconfig i have a problem with lets encrypt authorization procedure for website what running nginx + subdomain configured i think that most types of redirection inside a virtual host, for example created in administration by Redirect Path: /dev.example.com/ Code: # /etc/nginx/sites-available/example.com.vhost if ($http_host = "dev.example.com") { rewrite ^(?!/\b(dev.example.com|stats)\b)/(.*)$ /dev.example.com/$2 ; } makes unusable this location configuration Code: # /etc/nginx/sites-available/example.com.vhost location ~ /\.well-known/acme-challenge/ { root /usr/local/ispconfig/interface/acme/; index index.html index.htm; try_files $uri =404; } and the final effect is that this subdomain address http(s)://dev.example.com/.well-known/acme-challenge/empty.dir returns 404 not found Code: # /var/log/letsencrypt/letsencrypt.log Detail: Invalid response from http://dev.example.com/.well-known/acme-challenge/[hash] i think that it is really a problem because redirection for website, subdomain (or maybe aliasdomain) can be set through client/reseller administration = clients/resellers are able to break this authorization procedure for authorized websites i found this discussion and i think it is similar to my problem: https://git.ispconfig.org/ispconfig/ispconfig3/issues/4008 - but already closed/solved thanks for investigation