July 21, 2026
ARPHost
Firewall Configuration a Practical Step-by-Step Guide
Misconfigured firewalls still cause avoidable exposure on otherwise well-run systems. The pattern is familiar. A Linux host gets hardened, a…
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Latest news, tutorials, and updates from ARPHost
June 6, 2026
ARPHost
Firewall Configuration Done Right: A Hands-On Guide
A lot of teams touch firewall rules only when something is already broken. A new app won't connect. A VPN…
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April 23, 2026
ARPHost
Default FTP Port Explained (21, 20) & Secure Alternatives
The default FTP port for the control connection is TCP port 21, and the default data port is TCP port…
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