SSH is a protocol for securely exchanging data between two computers over an untrusted network. SSH protects the privacy and integrity of the transferred identities, data, and files. It runs in most computers and in practically every server. The SSH protocol and SSH keys secure hundreds of millions of maintenance sessions, file transfers, and automated processes - every day. The SSH client always initiates the setup of the secure connection, and the SSH server listens for incoming connection requests usually on TCP port 22 on the host system and responds to them.
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Updated Wednesday, October 7, , by Linode. In the Getting Started guide, you learned how to deploy a Linux distribution, boot your Linode and perform basic administrative tasks. Keeping your software up to date is the single biggest security precaution you can take for any operating system. Software updates range from critical vulnerability patches to minor bug fixes, and many software vulnerabilities are actually patched by the time they become public. There are arguments for and against automatic updates on servers. Not all package managers make that easy or possible, though. The practicality of automatic updates is something you must judge for yourself because it comes down to what you do with your Linode. Bear in mind that automatic updates apply only to packages sourced from repositories, not self-compiled applications.
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