Dedicated Servers

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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.

Dedicated servers are available for everyone who own Space Engineers. You don’t need an extra Steam account, you get Space engineers dedicated server for free to your existing Space Engineers account.

Notes:

• 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

Requirements

1. Windows PC (if you want to run the server as a "service" you need to use administration account)
2. .NET redistributable (version 4 or higher)
3. Static IP address, if you intend to host the game publicly, so that anyone from the Internet can connect to it

Installation

With Steam
Congratulations! You already have the dedicated server installed along with SE just go to the game’s installation directory
(browse to “ C:\Program Files(x86)\Steam\SteamApps\SpaceEngineers” or alternatively right-click on the game in your Steam library
select “Properties” and under the tab “Local Files” click “Browse Local Files…”). In the installation directory
you will find a folder named DedicatedServer(64) with the server’s executable.

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Without Steam
You need to obtain the dedicated server files
which can be found in the C:\Program Files(x86)\Steam\SteamApps\SpaceEngineers\Tools\DedicatedServer.zip archive
Extract the archive on the target machine and you should be ready to run the server
(you may need to install .Net redistributable from _CommonRedist folder - [www.microsoft.com/download/en/details.aspx?id=17851])

Command Line Tool

the following arguments can be used with SpaceEngineersDedicated.exe:

1. “-console” - starts a server instance as an application
   

Router and Firewall Settings

All info taken from the Official Page