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As a Cardano Stake Pool Operator (SPO) you are responsible for the health and security of the Cardano network. As a first step, access to your node or relay must be protected with at least two factor authentication (2FA), based on something you know (like a passphrase) and something you have (like a certificate on your laptop).
The most common tool used to remotely administer a Linux server is SSH. It is by default installed on Linux workstations or servers, and recent versions of Windows 10 include it as an optional component.
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