What type of hardware are you using: Old laptop or computer
What YunoHost version are you running: 12.1.23
How are you able to access your server: The webadmin
SSH
Direct access via physical keyboard/screen
Are you in a special context or did you perform specific tweaking on your YunoHost instance ?: Installed YunoHost with the official v.12.0 ISO
Describe your issue
Cloudflare describes here how to restore the original IP address of the visitors if the traffic is routed through the Cloudflare reverse proxy:
For nginx you need this module:
How to implement it to YunoHost?
Share relevant logs or error messages