nginx FritzBox webinterface reverse proxy

The following nginx config allows remote access to a local FritzBox over VPN etc. You explicitly need to set the Host header to in the proxied request - else, the FritzBox will reject the request as part of its rebind protection.

server {
        listen 80 default_server;

        access_log off;
        error_log  off;
        location / {
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header Host '';

On most linux distributions such as Debian or Ubuntu, install nginx using sudo apt -y install nginx or similar and place our config file as /etc/nginx/sites-enabled/default.