Hello oiaohm, I really very thankful to you for your replay. I checked many link in this file which you sent to me. Sir I need a VPN code in C,C++ programming language. and when I try to build they all work on the Linux. There I am blocked sir. I am downloaded the code from "www.openvpn.se" . Its binary file is working perfectly with my server. Now I have to implement this code in our application so I need to run this code. Please help me. Is there any other option available. Once again thank you for your reply sir.[/b]