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Asked: 2026-06-17T14:54:28+00:00

I’ve created a simple client/server program with the help of winsock in vb6. It

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I’ve created a simple client/server program with the help of winsock in vb6. It perfectly works on LAN but the problem is it doesn’t work on WAN. All ports are already open, Firewall is already Off, I have dynamic IP so I used No-ip to get named IP address.
One more think I want to ask is , is it important to open port on both client and server? For eg- I’ve created the program on port 50505 and on the client computer the port is open but is it important to open 50505 on server also??

Here is my project.

If anyone could find the problem please let me know. I would appreciate a lot

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  1. Editorial Team

    Okay, first make sure that in the client side program that the Localport is not set to anything because Windows will assign it one, but the RemotePort is set to 50505. On the server side, the RemotePort is set to nothing, and the LocalPort is set to 50505.

    Next you need to make sure your server has a static IP on your network.
    So if your router’s LAN IP is 192.168.1.1 you need to set your server’s to
    something like 192.168.1.50, just make sure that it doesn’t get put in the range or the
    DHCP server (That’s the server that gives each computer a IP address from the router).

    Next you need to setup your router for “Port forwarding”. Be default your router had no idea what to do with data that the internet sends to it. You have to setup the router to forward any data from port 50505 to your server on your network.

    While this seams really long and drawn out, it shouldn’t take more than 5-10 min’s to setup.

    Good luck!

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