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From my local machine, which command can tell me which machines I have connected via ssh, or ftp, etc? At the same time, which command can let me know which machines have tried to connect my machine via these different network protocols?

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    To check which port or address your computer is connected to try

    sudo lsof -i sudo netstat -l
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      The OP could also use ss (socket status) to see current connections.
      – Schives
      CommentedMar 14, 2017 at 23:17
    • @Schives you are right sudo netstat ss displays current connections.
      – Arthur Decker
      CommentedMar 15, 2017 at 9:33

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