Spam emails can overload your cPanel server and affect deliverability. By optimizing Exim and Tweak Settings in WHM, you can significantly reduce spam and secure your mail server. Follow this step-by-step guide to configure your server for better email security.
Learn how to install and use htop on all major Linux distributions. A powerful alternative to top, with real-time monitoring, mouse support, and modern features.
Master critical SSH and Linux shell commands with UnderHost.com. Discover how efficient server management starts with powerful terminal skills. Learn the commands that keep your offshore servers, cloud hosting, and dedicated servers running smoothly.
Keeping Exim up to date is crucial for security and performance on cPanel servers. cPanel provides a built-in script to upgrade Exim manually. Follow this quick guide to update your mail server with a single command.
An offshore server is located in a country other than the one where you or your customers are. It does not make a website private or unreachable: it still follows the laws of the country where it is hosted, and our Acceptable Use Policy applies on every server. Choose offshore hosting for a reason that fits your project, such as location near your users or a jurisdiction your business needs, and check the terms before you order.
ConfigServer Security & Firewall (CSF) is a popular firewall for Linux servers that includes a login failure daemon (lfd) to detect and block brute-force attacks. This guide will walk you through installing and configuring CSF on your server.
Start from a fresh, supported operating system (for example AlmaLinux 9), set a fully qualified hostname, update the system, then run the installer as root inside screen: cd /home && curl -o latest -L https://securedownloads.cpanel.net/latest && sh latest. When it finishes, open https://your-server-ip:2087 and complete the setup in WHM. Most install errors come from a server that is not fresh, a bad hostname, or too little disk space.
The IP Deny Manager in cPanel allows you to block specific IP addresses, domains, or entire IP ranges from accessing your website. This feature is useful for preventing malicious visitors, spam attacks, and unauthorized access.
An addon domain is a second, separate website on the same cPanel account, with its own folder, email addresses and SSL certificate. In current cPanel, open Domains > Domains, click Create A New Domain, enter the domain, untick Share document root, choose a folder such as example.net, and submit. Point the domain's DNS to your hosting first.
Set folders to 755 and files to 644, make sure every file is owned by your cPanel user, and never use 777. On cPanel, PHP runs as your account, so Joomla can write to its cache, tmp, logs and images folders without any world-writable permissions. Check the result in Joomla under System > System Information > Folder Permissions.
A simple tweak to your system’s hosts file can allow immediate access to a website without waiting for DNS propagation.
On cPanel hosting, set folders to 755 and files to 644. Protect configuration files that hold passwords, such as wp-config.php, with 600 or 640. Never use 777. Change permissions in Files > File Manager: select the item, click Permissions, tick the boxes or type the number, and save.
Encountering the "/usr/bin/crontab permissions are wrong. Please set to 4755" error in cPanel? Follow this simple guide to resolve it on RedHat, CentOS, or Fedora servers.
Disable Mailman mailing lists on your cPanel server by modifying its execute permissions.
Secure sensitive directories on your website by enabling password protection in cPanel.
The warning means Apache's worker limit (MaxRequestWorkers, called MaxClients before Apache 2.4) is set higher than ServerLimit allows, so Apache lowers it at start-up. On cPanel, change both values in WHM > Service Configuration > Apache Configuration > Global Configuration, not in httpd.conf. With the event or worker MPM, ServerLimit × ThreadsPerChild must be at least MaxRequestWorkers; with prefork, ServerLimit must be at least MaxRequestWorkers.
DNS resolution failures can cause serious connectivity issues on your server. If your system can’t resolve domain names, it could be due to a misconfigured /etc/resolv.conf or missing Perl modules. This guide walks you through troubleshooting steps to restore DNS functionality efficiently.
This alert comes from cPanel's service monitor (chkservd) when it cannot reach the SSH service. First check whether SSH really is down: systemctl status sshd. If it is stopped, test the configuration with sshd -t, fix the error it shows, and start it with /scripts/restartsrv_sshd. If SSH works but the alert continues, the monitor is probably checking the wrong port after a port change. Use your provider's console if you cannot log in at all.
Practical, real-world articles on offshore hosting, Linux and cPanel administration, server security and the technology behind our network, written by the UnderHost team.
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