Direct access to pfsense ip address and haproxy

[braunerroei]

Hello

My pfsense ip address is 192.168.1.220, I use it as a reverse proxy server.
I created frontend and backend for port 5001 (port is open in firewall) to go to my Synology NAS, there is no acl.

When I use http://dsm.mycompany.com:5001 it goes to the NAS.

When I use http://192.168.1.220:5001 it doesn't go to the NAS.

Why?

Should I change the frondend type to ssl/https(tcp mode)?

-Roei