[SOLVED] Nginx Reverse Proxy Issue

Hi, here is my nginx reverse proxy , the issue is the "location /mon/" is not working,
server {
listen 80;
server_name log.mydomain.com;
return 301 https://$host$request_uri;
}

server {
listen 443 ssl http2;
server_name log.mydomain.com;
ssl_certificate /etc/letsencrypt/archive/mydomain.com/cert1.pem ;
ssl_certificate_key /etc/letsencrypt/archive/mydomain.com/privkey1.pem;

location / {
proxy_pass http://127.0.0.1:5601;
}
location /mon {
proxy_pass http://127.0.0.1:9100;
}
}

Any idea ?
THX