Space Engineers utilises a steam group system to keep your server private. To set it up just follow the instructions below
1. Create a steam group
2. When you have created your steam group go to http://steamcommunity.com/groups/[groupname here]/memberslistxml/?xml=1 (inserting your group name into the URL)
3. Copy the ID64 then log into your game panel > game services > select your server > configuration files > configuration editor
4. paste your group ID in the field "Steam Group ID"
Your server should now only appear to those in your steam group.
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