The nginx server block is listening on a port other than 80, if that matters. It’s all my VPN provider will allow me to forward.
server {
listen [PORT];
server_name mysite.i2p;
location / {
proxy_pass http://127.0.0.1:7657/;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
}


that error is coming from I2P, not nginx
so good news? your nginx configuration is probably fine
bad news? I know fuck all about I2P. assuming you’re intending to reach the “router console”, you could probably follow the suggested configuration change in the error message to Do That Thing