@bingo600
What I wrote about 'private network' means Windows network.
When I plugged in server after PFSense, it connected with Private Network and it didn't let me allow to access internet or core switch. Probably firewall rules block my ping attempt, anyway I needed to be in company network domain.
However, after I setup the DNS server ip address to PFSense - System - General Setup then my server network is correctly on our domain network.
Still I don't get it why I need to configure DNS server IP address to PFSense firewall. It doesn't matter when I setup with Unifi switch after PFSense, but with the Cisco switch it was an issue.
For the DHCP, we don't use DHCP on PFSense and server networks are always use static IP.
Thanks to you, I have checked DNS setup on PFSense configuration and the problem solved.
I am really appreciate your reply.