How to Join Your Kerbal Space Program Server

Kerbal Space Program has no built-in multiplayer mode. Your server uses the community modification DarkMultiPlayer (DMP) for that. Every player needs the matching DMP client in their KSP installation – without the mod there is no way to join a server from inside the game.

Find connection details

Install the DMP client

1. Download the client
   Open d-mp.org/downloads and download the file DMPClient.zip.

2. Open the KSP folder
   Open the installation folder of Kerbal Space Program. On Steam you get there by right-clicking the game in your library and choosing Manage → Browse local files.

3. Extract the mod
   Extract the archive and copy the folder DarkMultiPlayer from DMPClient/GameData/ into the GameData folder of your KSP installation. The resulting path looks like this:

   [KSP folder]/GameData/DarkMultiPlayer/
   

4. Start the game
   Launch Kerbal Space Program. The DarkMultiPlayer window with the installed version now appears in the main menu.

Add the server and join

1. Set your player name
   Enter your name in the Player name field of the DMP window. It can be up to 32 characters long.

2. Add the server
   Click on Add. Three input fields appear:

   Field	Value
   Name	Any display name you like for your server
   Address	The IP address of your server from the dashboard
   Port	The Game Port of your server from the dashboard

3. Save the entry
   Click on Add server. Your server then shows up in the server list of the client.

4. Connect
   Select the entry in the list and click on Connect. The entry is saved – next time you only have to select it and click Connect.

Server does not show up in the public list

The Servers button in the DMP client shows a public server list. That list comes from central master servers a server has to report to actively. Your server is not listed there by default.

Player name and keys

The first time you join, the server creates a file containing your public key:

/Universe/Players/<player name>.txt

From that moment on the player name is tied to your key pair and nobody else can use it. Your keys are stored locally at:

[KSP folder]/GameData/DarkMultiPlayer/Plugins/Data/publickey.txt
[KSP folder]/GameData/DarkMultiPlayer/Plugins/Data/privatekey.txt

Connection is rejected