Load Balancer shows "Status : Down" despite the droplet can be accessed by IP address.

Load Balancer shows “Status : Down” despite the droplet can be accessed by IP address.

Load balancer setting: Forwarding rules : HTTP on port 80 => HTTP on port 80 HTTPS on port 443 => HTTPS on port 443 TCP on port 8443 => HTTP on port 8443 (I am using 8443 port for socket.io/node.js for chat feature)

Algoristhm: Round Robin

Health checks : http://0.0.0.0:80/ Sticky sessions : Off SSL : No redirect Proxy Protocol : Enabled Backend Keepalive : Disabled

Droplet Setting: Ubuntu The Firewall is disabled. *I can access to the server by IP address.

I use the Cloudflare WAF. I pointed the domain to the IP address of Load balancer.

The result is as follows… “503 Service Unavailable No server is available to handle this request.”

I can directly access to the droplet by the IP address. Can anyone help me to resolve this issue ?