nginx: client address headers only from $remote_addr (realip). X-Forwarded-For was appended to and CF-Connecting-IP passed through from the client, so a request reaching the origin without Cloudflare (DNS-only host or the bare IP) chose the address the service bans and rate-limits by

ddiff --git a/deploy/nginx/openvibe.wiki.conf b/deploy/nginx/openvibe.wiki.conf
iindex a59e0b3..86788cf 100644
---- a/deploy/nginx/openvibe.wiki.conf
++++ b/deploy/nginx/openvibe.wiki.conf
@@@ -74,7 +74,8 @@ server {
      proxy_set_header Connection "";
      proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
--    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
++    proxy_set_header X-Forwarded-For $remote_addr;
++    proxy_set_header CF-Connecting-IP $remote_addr;
      proxy_set_header X-Forwarded-Proto $scheme;
      # Never let a shared cache here hold a personalised or private answer.
      proxy_no_cache 1;