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Log into your control panel. Please be aware that you can also make your Rust server private by installing Oxide, learn how at https://logicservers.co.uk/client/knowledgebase/36/Installing-Oxide-on-your-Rust-Server.html 
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Go into your configuration files. 
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Add the following line into your server.cfg 
Server.steamgroup <steam group id>
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Be sure to save these changes and restart your server. 

 
          