When a company mailbox stops working, the root cause almost always falls into one of three buckets: DNS records that are missing or wrong (SPF, DKIM, DMARC, MX), mail client settings that do not match the server, or a quota…
Intermittent network connectivity on a Linux server can be difficult to diagnose because the connection may work normally for several minutes before becoming slow, dropping packets, or timing out. Unlike a complete network outage, intermittent problems often leave few obvious…
A Linux server security audit checklist helps VPS administrators identify security vulnerabilities, review server configurations, and strengthen overall system security. By following this checklist, you can inspect user accounts, SSH access, firewall rules, software updates, file permissions, authentication logs, and…
Are you experiencing a cPanel LMTP error when sending emails to another email address on the same domain? This is a common email delivery issue on cPanel servers that can prevent messages from reaching their intended recipients. In most cases,…
Linux root filesystem full is a common server issue that can prevent applications from writing files, cause services to fail, and make system administration difficult. When the root filesystem reaches 100% usage, even routine operations may stop working correctly. This…
Introduction On 21 October 2026 the PHP project released emergency security updates for two critical flaws, tracked as CVE-2026-109618 and CVE-2026-109619. Each one is rated 9.2 out of 10 under CVSS v4.0, and each can let an attacker on the…
Linux mount errors after reboot can prevent a server from accessing important disks, backup storage, or application files. The problem may be caused by an incorrect /etc/fstab entry, a missing disk, a changed filesystem UUID, or filesystem errors. Checking the…
How to find files on a Linux server is an important skill when troubleshooting disk space problems. Large log files, old backups, database exports, and application uploads can consume storage without being noticed. Linux commands such as find, du, and…
How to back up a Linux VPS before major system changes is an important step in protecting your data, applications, and server configurations. A package upgrade may break a service, a configuration change may prevent an application from starting, or…
Systemd is the service manager used by many modern Linux distributions, including Ubuntu, Debian, AlmaLinux, Rocky Linux, and other Linux-based operating systems. It manages system services, starts processes during boot, and helps administrators monitor whether applications are running correctly. Sometimes,…