Port forwarding from OpenVPN Client to Public Internet

I need to forward port 44444 of my VPN client to the public internet with my public IP on port 44444, how i can do this?

The VPN Server is mine and I have root access.

Example how i can do this? WANIP:44444-> 172.27.224.2:44444 (VPN LOCAL IP) ?

I'm trying with this but no success:

sysctl net.ipv4.ip_forward=1
iptables -t nat -A PREROUTING -d WANIP -p tcp --dport 44444 -j DNAT --to-destination 172.27.224.2:44444
iptables -t nat -A POSTROUTING -d 172.27.224.2 -p tcp --dport 44444 -j SNAT --to-source WANIP

Interface of WAN IP is eth0 and Interface of VPN LOCAL IP is as0t0

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