VPN MTU Fragmentation: Fixes for Slow VPN Throughput
Find the real path MTU with ping and tracepath, spot ICMP black holes and PMTUD failures, set the right MTU and MSS clamping on WireGuard, OpenVPN and IPsec tunnels on Linux and pfSense, and measure the throughput gain with iperf3.
September 29, 2026
Imunify360 After OS Upgrade: Recovery on Ubuntu and AlmaLinux 9
Repair Imunify360 after a do-release-upgrade, Debian major upgrade or ELevate run leaves the agent failing to start, using the deploy script's post-os-upgrade mode, repository fixes and verification of the firewall, WebShield and WAF.
September 29, 2026
Cloudflare Tunnel (cloudflared): expose an internal service without opening ports
Install cloudflared on a Linux host, create a named tunnel, publish an internal web service on a public hostname with no inbound firewall rules, run it as a systemd service, add Cloudflare Access in front, and verify connectivity.
September 29, 2026
Ubuntu vs AlmaLinux cPanel 2026: Best OS for a New Server
A decision guide for the operating system under a new cPanel server in late 2026, comparing Ubuntu 24.04 with AlmaLinux 9 and 10 on support lifetime, database and PHP availability, CloudLinux and CSF compatibility and kernel patching.
September 29, 2026
Replace CSF with firewalld and fail2ban: Secure Step-by-Step
A complete walkthrough for removing CSF and LFD from an AlmaLinux 9 or 10 server and rebuilding the same protection with firewalld zones and fail2ban jails for SSH, mail, FTP and panel logins, including verification and rollback.
September 29, 2026
cxs Replacement: Free Malware Scanning with LMD and ClamAV
ConfigServer eXploit Scanner died with ConfigServer; this guide sets up Linux Malware Detect with ClamAV as its engine, explains where ImunifyAV fits, and shows how to reproduce cxs upload scanning and scheduled sweeps on cPanel and plain Linux.
September 29, 2026
Rocky Linux cPanel to AlmaLinux 8/9: Safe Migration Before Updates Stop
cPanel & WHM 134 removed Rocky Linux support, so Rocky 8 and 9 servers cannot move past version 133. This guide covers the in-place conversion to AlmaLinux and the checks to run before and after.
September 29, 2026
mariadb-dump vs mysqldump: modern backup commands and wildcard database dumps
How the mariadb-dump command differs from the mysqldump symlink it replaces, the options every hosting backup script should use, the wildcard database selection added in MariaDB 12.1, and how to check a dump is complete and restorable.
September 29, 2026
Postfix MailBaby Smarthost on Ubuntu and Debian: Secure Setup
Configure Postfix on Ubuntu 22.04/24.04 or Debian 12/13 to relay all outbound mail through relay.mailbaby.net with LOGIN SASL authentication and STARTTLS, including sasl_passwd hashing, rate limiting under the 6,000 per hour cap and log verification.
September 29, 2026
Install DirectAdmin on AlmaLinux 9/10 and Debian 13: 2026 Guide
A clean-server walkthrough for installing a modern-license DirectAdmin build on AlmaLinux 9, AlmaLinux 10 or Debian 13, covering the preparation checks, the choice between the web installer and setup.sh, and the first post-install verification steps.
September 29, 2026
Installing Sentinel Firewall as a drop-in CSF replacement on Ubuntu 24.04 and Debian 13
How to remove an unmaintained CSF install from an Ubuntu 24.04 or Debian 13 server and put Sentinel Firewall in its place, reusing existing csf.conf, allow and deny files, then confirming the rules and login-failure blocking work.
September 29, 2026
KernelCare Setup on cPanel and DirectAdmin: Reliable Patching
How to install KernelCare live patching on a cPanel or DirectAdmin host, register it, confirm patches are applied for named CVEs, keep it current automatically, and unload patches when a kernel package update or a suspected regression demands it.
September 29, 2026