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When I host the game my friend can't connect to me.

Our IP addresses are 192.168.1.100 and 192.168.1.101.

When I run second instance of Game.exe I can connect myself without any issues.

Both computers has Windows 7.

I tried to find some information on Google to configure Windows. There was advice to remove IPv6 protocol, but it doesn't help.

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Are you on the same local network? – ver Jan 15 '12 at 12:29
Yes, and I have similar trouble with Warcraft3 – Vyacheslav Loginov Jan 15 '12 at 14:07
turn off your firewall? – spartacus Jan 15 '12 at 14:11
2  
Can the two computers communicate over tcp/ip at all? Can you successfully excute ping commands from each of them to the respective other? – Juergen Hartelt Jan 15 '12 at 14:17
yes, ping works – Vyacheslav Loginov Jan 17 '12 at 17:58

2 Answers

up vote 4 down vote accepted

Since the two computers are on the same local network, as you confirmed, it might be an issue of either network configuration in general or firewall configuration on at least one of the machines.

There is a support article on Battle Net about neccessary tcp and udp ports for Diablo2. I suggest to look it through, but the core info is:

Diablo II/Lord of Destruction: TCP Port 6112 and Port 4000.

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up vote 4 down vote

While, for security reasons, I wouldn't recommend disabling your Windows Firewall completely, it might help in diagnosing the issue. This article will help you disable it and in either event enable it again. It's also possible either an intermediate router or an additional piece of virus scanning software may be imposing yet another firewall.

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