Dedicated servers in Space Engineers allow players to connect to a third party host, rather than using a player-host, in a peer-to-peer set-up. They are game instances intended for long time multiplayer games. They don’t depend on any player and they run without render and visual/audio effects. This will result to a faster connection and a more fluent multiplayer performance with less lag.
Alternatively you can rent a Space Engineers Dedicated Game server from one of the official hosting providers.
- Dedicated servers are currently allowed only for non-commercial use, so companies that host game servers or everyone who wants to host his server at such company will not be able to do so (this will be available very soon).
- In order to run a dedicated server, players don't require a licensed copy of the game. However to legally obtain the game server files, at least one Steam account needs to have a valid license.
Dedicated Servers sub-forum
Dedicated Server Guide
- Windows PC (if you want to run the server as a "service" you need to use administration account)
- .NET redistributable (version 4 or higher)
- Static IP address, if you intend to host the game publicly, so that anyone from the Internet can connect to it
On PC With Steam:
The Dedicated server is installed along with SE Right-click on the game in your Steam library Select “Properties” and under the tab “Local Files” Click “Browse Local Files…”) Open folder "DedicatedServer(64)" In this folder you with find the server's executable
On PC Without Steam:
Go to "C:\Program Files(x86)\Steam\SteamApps\SpaceEngineers\Tools" Extract the archive on the target machine Make sure Microsoft .NET Framework 4 is installed You should be ready to run the server
Quick Server Setup
Basic setup as a foreground process:
Run SpaceEngineersDedicated.exe Choose “Local/Console” item in list of servers Click “Continue to server configuration” Here you can set variety of options. They work the same way as in the game. Fill in the name of the server Press “Save config and start” and you are ready to play
Setup as a service:
Run SpaceEngineersDedicated.exe as Administrator Press the “Add new instance” button Fill in the name of the service (must be unique system-wide) Choose the service you just created from the list of server instances Setup your game the same way as with a foreground process Pay attention to ports in “Server settings”, as a single port can only be used by one server instance
1. Server List
- Here you can see the list of the server instances. There’s always one instance named “Local/Console” and optionally several other instances with custom names.
- The “Local/Console” instance is run on foreground as a standard application and is always there, while the other instances that the user creates are run in the background as Windows services.
2. Global Configuration
- Here you can set, whether the game log files should have dates appended to them and whether the server should automatically send the log files to Keen Software House upon crash.
3. Service Management
- This message is shown when the application is not run with administrator right.
- If you want to create or manage the server as a service you need administrator rights. The button “Run as Admin” will restart the application with administrator rights.
- "Add new instance"
- Creates a new instance of the dedicated server as a Windows service.
- "Remove instance"
- Continue to server configuration - Starts server instance configuration utility for the selected instances.
- "Continue to server configuration"
- Starts server instance configuration utility for the selected instances.
- Closes the configuration utility
1. New game / Saved worlds option
- Lets you choose between starting a new world generated from a scenario or loading a previously saved world.
- The previously saved worlds are loaded either from the “AppData\Roaming\SpaceEngineersDedicated” folder in your home directory
- (e.g. “C:\Users\John.Doe”) or from the “ProgramData\SpaceEngineersDedicated” folder in the system root.
- To be able to play a world on the dedicated server that you previously created and saved in the game you will have to copy it from your save game directory “AppData\Roaming\SpaceEngineers” to the respective folder.
2. Game settings
- Scenario can only be chosen for the “New game” option
- Asteroid amount sets the number of major asteroids to generate when creating a new game.
- GameMode sets the current game mode to creative or survival
- OnlineMode Currently private/friends have no effect.
- MaxPlayers Sets the maximum number of players, there seems to be no restriction here. Keep in mind that more players requires more server resources.
- MaxFloatingObjects Sets the maximum number of floating items in the game, it is recommended to set this to a lower number to keep lag to a minimum.
- EnviromentHostility Sets the environment setting, keep in mind that a hostile environment is hostile 24/7, even when players are not connected to the server.
- AutoHealing If yes, players will heal if they are not actively taking damage
- EnableCopyPaste Creative Setting only. Allows copy and paste function on the server
- AutoSave Allows the server to save the map. WARNING - There is no manual save option with the server at this moment.
- WeaponsEnabled Allows weapons to shoot
- ShowPlayerNamesOnHud Shows player names if they are unobstructed regardless of distance between them.
- ThrusterDamage Toggles thruster damage on and off
- CargoShipsEnabled Toggles cargo ships.
(Warning: Values out of the range allowed by the game user interface are not tested and officially unsupported. They can seriously affect the game experience and performance)
3. Server settings
- "Listen IP"
- Address of network interface that the server will listen on. This can be set to “0.0.0.0” (which is the default value) to listen on all interfaces, which should work fine in most cases
- "Server port"
- Number of the port that the server will listen on
- "Server name"
- Name that will be shown in the server list
- "Server admins"
- Steam IDs (not nicknames) of the players with administrator privileges on the server (such as kicking and banning other players), each of them on a separate line (64bit SteamID)
- "Steam Group ID"
- If set to non-zero value, the dedicated server will only be visible for the given Steam group
- "Save config"
- Saves the configuration for the current server instance
- "Edit config"
- Opens the current instance’s configuration file in a text editor for manual editing
- "Save config and start"
- Saves the current configuration and starts the server either as a foreground application or as a system service
- (only for service instances) Restarts the server instance
- (only for service instances) Stops the server instance
- "Back to instances"
- Returns to the screen with the list of server instances
- Closes the configuration utility (but not the dedicated server, if it is running as a service)
- By “Steam ID” we mean the unique numerical identifier for a Steam account in the 64-bit format.
- Your Steam ID in this format can be found in the game log after running the game with Steam logged-in to your Steam account
- (see above) or using external tools like http://steamid.co/ or https://steamid.xyz/
Servers can be restricted to Steam groups to better control access.
Servers that are unrestricted should show a groupID of 0 in the groupid field in the server configuration window
The group ID in the server configuration window references the GroupID64 not the Group ID on the profile page of your group. To properly fill out the group ID field you must obtain your group ID64. 
- Navigate to your steam community page, in steam or in a browser.
- If you navigated to it in steam, right click the page then select Copy Page URL and paste it into a browser.
- Append /memberslistxml/?xml=1 to your URL, If your group name is Example your url will look like this: http://steamcommunity.com/groups/example/memberslistxml/?xml=1 
- On the page that opens up copy your GroupID64 from between the GroupID64 tags.
- Paste that number into the group ID field.
Command Line Tool
the following arguments can be used with SpaceEngineersDedicated.exe:
- “-console” - starts a server instance as an application
Router and Firewall Settings
- If you intend to run a game that people from all over the Internet can connect to, you will need a static public IP address. Your internet service provider should tell you whether you have one or not. Without the static IP address, you will be able to host a dedicated server on your LAN, but people from outside the LAN won’t be able to connect to it.
- The game uses UDP protocol to communicate. The default listen port is 27016, but this can be changed in the config tool. In order for people to be able to reach your server, you will have to configure your router to forward all incoming UDP traffic on port 27016 (or any other that you have specified) to the computer where your dedicated server is running.
- if you don't know how to open ports go to http://portforward.com/
All info taken from the Official Page
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