Can connect from LAN but can't from WAN

[brusebas@gmail.com]

HEllo everybody.
I can connect to VPN from my LAN but I can't from WAN.
If I connect from WAN (I have configured port forwarding and I also put the VPN server in the DMZ for testing purposes), I am not able to get connected. Tried with my mobile and with laptop. The same clients as are able to be connected from LAN.
I am using the virtual appliance for OpenVPN server.
If I conect from WAN to my public IP address at port 443 via a web browser, I can access "OpenVpn" admin page. I also can see logging in OpenVPN server (/var/log/openvpnas.log).
If I try to connect with OpenVPN client, I cannot see any logging in OpenVPN server.
Any ideas to solve this issue??

Thanks,

Bruno