If you buy a dedicated server or a VPS on Linux on the Internet, you will quickly notice that it will receive many attacks from hackers every day.
It's therefore important to make your Linux server as secure as possible as soon as you add services to it to prevent an attacker from having time to use a security breach or from being able to take control of your server, your website, your email addresses, ...
For this, there are tools for blocking attacks and others for using the secure version of known protocols such as HTTPS, IMAPS, POP3S, FTPS, ...
SASL (Simple Authentication and Secure Layer) is a component that adds a simple authentication to a connection-oriented protocol.
iptables is not a firewall, but a tool to configure the Netfilter firewall.
10 years after DDOS Deflate, No More DDOS is the new DDOS protection system for the major GNU/Linux operating systems !
Ssh (Secure Shell) is a program for logging into a remote machine and for executing commands on a remote machine. It provides secure encrypted communications between two untrusted hosts over an insecure network.
OpenSSL can : create certificates, secure the connection to a server over SSL (either : the web "https", access to mail via POP3S or IMAPS, ...).
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