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I'm trying to create and join a multiplayer game that has been created from a custom UDK installation.

It works correctly when two (or more) instances of the game are created on the same computer and are connected over localhost by running the following commands:

udk.exe server map_name
udk.exe 127.0.0.1

The problem comes when trying to connect to the game server over a LAN (with the command udk.exe server_ip_address); the clients are unable to connect and the default map is loaded. The server log reports a client disconnection from the computer trying to connect. The client log reports the error, Error: Can't start an online game that hasn't been created.

Both computers are able to ping each other, as well as both having their firewalls disabled. Many combinations of the command-line arguments for starting the server have been tried. Creating an installer from the server machine and installing a fresh copy of the game on the client has also been tried.

Any solutions on how to solve this issue would be appreciated.

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  • \$\begingroup\$ Is the server bound to the correct interface? If it works locally its possible its just binding to the localhost/loopback interface. Then again I have no idea about the UDK. \$\endgroup\$ Commented Dec 2, 2013 at 2:13
  • \$\begingroup\$ Have you tried: udk.exe server map_name?lan (or ?bIsLanMatch=true) \$\endgroup\$ Commented Dec 2, 2013 at 22:27
  • \$\begingroup\$ @Phillip, yes I have. \$\endgroup\$ Commented Dec 3, 2013 at 0:28

1 Answer 1

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I've finally found the correct answer, thanks to this thread on Epic's forum: http://forums.epicgames.com/threads/735202-Multiplayer-testing-problems-Solved

In order to play a networked game, the following files need to be identical on every client and also the server.

  • GameUniqueID in Binaries\UnSetup.Game.xml
  • UDKGame\Script\*
  • UDKGame\Content\*
  • UDKGame\Config\*
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