Client / Server connect via router.

My Problem: Listening Server on LAN.? Server IP: [login to view URL] Client on Internet? needs to connect to my server and not able to do so. Is there a way for client to connect to my Server without opening port or port forwarding in router. I know how to open ports on my router. and I know how to use third party server. ? But is there a alternative way. Can it be done programmatically.? Maybe something like Tunnel?? I want direct connection bet client and server.? Do not want to use third party server. Code in Vb6. Works with 7 and XP. Note app is distributed to customers and most do not know how to port foward or open ports.? And traffic is heavy so I do not want to use third party server. I want direct connection. ? ## Deliverables attached app