Cannot reach to OpenVPN Server IP from LAN behind pfSense

[oger]

I am trying to connect my "home-LAN" to a OpenVPN-server on the Internet.

Lan : 192.168.171.x
pfSense LAN : 192.168.171.1
pfSense WAN: dhcp client.
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Server IP adress : 213.xxx.xxx.xxx
Server OPENVPN : 192.168.201.1

When pfSense connects to the server it receives an IP-Adress - 192.168.201.18
VPN interface (tun0)

Status up
IP address 192.168.201.18 
Subnet mask 255.255.255.255
In/out packets 2560/3034 (210 KB/250 KB)

and rules are added :
192.168.201.0/24 192.168.201.17 UGS 0 1096 1500 tun0
192.168.201.17 192.168.201.18 UH 1 0 1500 tun0

From the OpenVPN Server I can Ping to 192.168.201.18
But I cannot Ping to 192.168.171.1

From the pfSense I can ping to 192.168.201.1
But I cannot Ping to 192.168.201.18

From the LAN i can I can Ping to 192.168.201.18
But I cannot Ping to 192.168.201.1

I am struggling with this problem for weeks now can anybody help me?