Protect Your VPS With an Electronic Pitbull: Active Firewalls
A firewall is a security tool that blocks network traffic, with many different configuration options. For example, you could configure your firewall to block all traffic except attempts to connect to port 80 and 443 (for a web server) as well as your ssh port. This is an example of the best practice of "blocking everything except what is explicitly allowed". However, even with this sort of policy in place, the security...
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