Minecraft Server - Same Network -> Brother can't connect

We've been able to get this to work before but now that we've come back after a few months, my brother is no longer able to connect to my minecraft server.
I am not doing a LAN server because my cousins who live elsewhere want to play as well; all of them have been able to connect to my server using my local IP with no problems whatsoever.
Things you should know:
- We use a Windows 7 Wired Desktop Computer as the Host computer.
- We use a Belkin Router.
- My Brother's computer is a Laptop.
I think I've tried everything I found on the internet and it's getting frustrating because it just will not work! I also tried this:
- Port forwarding
- I've given my brother my IPV4 & Local IP address but none of that has worked.
- We've tried using port 25565 and without it host computer a DMZ but that had no luck as well.
- I've disabled firewalls from both ends and that hasn't worked either.
Is there a reason for this?
Best Answer
Well, if you are not using LAN than you need to port forward your IP. It is different depending on your router but I would suggest looking up a port forwarding tutorial. You just need to make sure that you use the correct IP when doing this. Once you have port forwarded you should be able to give your friends your public IP address. To figure this out just type in "my ip" in Google. Your friends should be able to connect once you do this.
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When I try to join my friends Minecraft server it says unable to connect?
Possible solutions are: Check that your network connection is enabled, and that no programs are blocking outgoing connections. Try disabling any existing firewall program, or changing its configuration options. Restart your modem/router.How do I connect to a Minecraft server with the same IP?
So to the same local IP, assign a second port with 25566 through 25566 and under "port requested outside" also choose 25566 . Make sure to save the settings. If someone wants to connect to you servers now, they have to know your public IP-adress (again you can look it up with Google "What is my IP") and the port.Minecraft - Friends Can't Join Server (Solution)
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Answer 2
Allow Java through your windows firewall (both the inbound and outbound connections) and you should be good. Do this on both computers.
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Images: Brett Sayles, Jessica Lewis Creative, Ketut Subiyanto, Ketut Subiyanto