Connection to OpenVPN on Ec2 fails (Server/Client Ubuntu)

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http://serverfault.com – I have setup a VPN server on my Ec2 instance successfully and can see ifconfig tun0. The port 1194 is also free. However my client can't access the server. I have already created the certificates. Somehow the handshake fails and i dont understand why. On the server log, I can see the incoming call from my client. So the port is perfectly fine. Can a pro help me please? Mon Mar 25 06:52:55 2013 OpenVPN 2.2.1 x86_64-linux-gnu [SSL] [LZO2] [EPOLL] [PKCS11] [eurephia] [MH] [PF_INET6] [IPv6 payload 20110424-2 (2.2RC2)] built on Oct 8 2012 Mon Mar 25 06:52:55 2013 NOTE: OpenVPN 2.1 requires ' (HowTos)