Guides tagged “security”

Step-by-step MdmHost guides about security, sorted A-Z.

193 guides · page 5 of 10

Imunify360 WebShield and CAPTCHA pages explained
Why visitors sometimes see an Imunify360 CAPTCHA or challenge page, how WebShield and the grey list work, and what to do if real visitors or bots you need are challenged.
BeginnercPanel hosting with Imunify3603 min read
ImunifyAV, ImunifyAV+ and Imunify360: what is the difference?
Compare ImunifyAV, ImunifyAV+ and Imunify360 for cPanel servers: malware scanning, automatic cleanup, firewall, WAF and Proactive Defense, and which one fits your server.
BeginnercPanel servers2 min read
Install and configure CSF and LFD firewall on a cPanel/WHM server
Install ConfigServer Security & Firewall (CSF) with LFD on a WHM server, set the essential csf.conf options, take it out of testing mode and manage it from WHM.
AdvancedWHM (root)3 min read
Install and secure MariaDB or MySQL, and allow remote access safely
Install MariaDB (or MySQL), lock it down, create a least-privilege app user, and connect remotely the safe way: an SSH tunnel or a single allowed IP.
IntermediateLinux server3 min read
Install Imunify360 on DirectAdmin, Plesk or a server without a panel
Install Imunify360 with i360deploy on DirectAdmin, Plesk or a standalone server: licence key, firewall conflicts, first settings for malware scanning and WAF, and checks.
AdvancedDirectAdmin / Plesk servers2 min read
Install Redis and Secure It with a Password
Install Redis on Ubuntu, Debian, AlmaLinux or Rocky Linux, set a password with requirepass, and confirm the server rejects unauthenticated commands.
BeginnerLinux server3 min read
iptables basics: list, allow, drop and save rules
Learn how iptables chains and rule order work, then build a small ruleset that allows SSH and web traffic, drops everything else and can be edited by line number.
IntermediateLinux server6 min read
Keep cPanel & WHM updated: Update Preferences and upcp (root guide)
Choose the right cPanel release tier, set automatic updates for cPanel and system packages in WHM Update Preferences, run upcp manually and handle failed updates.
AdvancedWHM (root)2 min read
Keep WP Squared sites updated and secure
Set an update policy for WP Squared sites, apply core, plugin and theme updates centrally, use SSL and strong logins, and respond to security warnings quickly.
IntermediateWP Squared3 min read
KernelCare live patching explained: kernel updates without reboots
How KernelCare applies Linux kernel security patches without rebooting, what it covers on CloudLinux and AlmaLinux servers, how to install and check it, and its limits.
AdvancedLinux servers (root)2 min read
Linux Firewall: Using iptables to Implement Connection Tracking Limits
Cap new and simultaneous connections on a Linux VPS with iptables conntrack, limit, connlimit and hashlimit rules, and size the conntrack table so it does not fill up.
AdvancedLinux server7 min read
Linux Firewall: Using nftables to Drop Malformed Packets and Attack Vectors
Build nftables chains that drop malformed packets, invalid conntrack states and common scan patterns before they reach your services, then verify the counters.
AdvancedLinux server7 min read
Linux Firewall: Using UFW to Block Specific Source IP Ranges Automatically
Block a source IP range in UFW with one command, then keep a blocklist file and a cron job that re-applies it so new ranges are dropped without manual work.
IntermediateLinux server6 min read
Linux Hardening: Securing System Binaries with SELinux or AppArmor
Put SELinux or AppArmor into enforcing mode and write a policy that limits what a system binary can do, even if an attacker takes it over.
AdvancedLinux server5 min read
Linux kernel updates: when and how to reboot your VPS
Learn how kernel updates work on Ubuntu, Debian, AlmaLinux and Rocky Linux, how to tell if a reboot is needed, and how to reboot a VPS safely with minimal downtime.
IntermediateLinux VPS2 min read
Linux Security: Hardening the sudoers File for Least Privilege
Restrict sudo to the exact commands each administrator needs. Write safe sudoers drop-in files, validate them with visudo and keep an audit trail of privileged commands.
AdvancedLinux server6 min read
Linux Security: Using aide for File Integrity Monitoring on VPS
AIDE builds a checksum database of your system files and reports anything that changed. This guide installs it, creates a baseline, tunes the rules and schedules daily checks on a Linux VPS.
AdvancedLinux server6 min read
Linux Update Strategy: Testing Security Patches Before Production
Build a Linux update strategy that tests security patches on a staging server first, then promotes them to production with a canary rollout and a rollback path.
AdvancedLinux server6 min read
LiteSpeed anti-DDoS: per-client throttling, reCAPTCHA and bot protection (root guide)
Protect a LiteSpeed cPanel server from floods and bad bots as root: per-client connection throttling, server-level reCAPTCHA, wordpress brute-force protection and safe limits.
AdvancedcPanel server with LiteSpeed (root)3 min read
Local Security Policy basics on Windows Server
A guided tour of secpol.msc on a standalone Windows server, covering password and lockout policy, user rights, audit policy and security options, plus how to back up settings with secedit.
IntermediateWindows server5 min read

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