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“undefined” Appended to URL Causing 404 Page Not Found Error

When checking Apache HTTPD or Nginx web server access log, there are plenty of 404 Page Not Found in the access or error log caused by URLs that are been appended or added with /undefined at the [...]

No iptables / ip6tables Bootup Action Was Found at Webmin Networking in CentOS / RHEL / Fedora 7

When going to Linux Firewall module in Webmin Networking (which also used by Virtualmin and Cloudmin), the following error message is displayed: No iptables bootup action was found, indicating that the IPtables package is not installed on [...]

How to Use Let’s Encrypt SSL Certificate Automatically in Virtualmin / Webmin

Since Webmin 1.78 and Virtualmin 5.0, Webmin can request an SSL certificate for itself from Let's Encrypt, the free, automated and open certificate authority (CA), if you have the letsencrypt client command installed. The built-in Let's Encrypt [...]

How to Automatically Renew & Replace Let’s Encrypt SSL Certs

The free SSL certificates generated by Let's Encrypt has the lifetime of only 90 days. In other words, it will expire in 3 months. Thus, the Let's Encrypt SSL certificates have to be renewed every 90 days [...]

How to Request, Generate & Setup Free Let’s Encrypt SSL Certificate

After downloading and installing Let's Encrypt client on your web host, you're ready to create and set up the free SSL certificates signed by Let's Encrypt. The SSL certificates can be used to secure the websites with [...]

How to Install Let’s Encrypt in CentOS / RHEL / Fedora / FreeBSD / OpenBSD / Ubuntu / Linux

Let's Encrypt is a free, automated, and open certificate authority (CA) that provides Domain Validated (DV) certificates essential for SSL, which enables the HTTPS secure connection that encrypts data transfer. . The DV certificate verifies that you [...]

Apache HTTPD Address Already In Use: Make_Sock: Could Not Bind to Address 80 / 443 Error

When starting or restarting Apache HTTPD server which was previously working properly, error occurred and the Apache HTTPD service could not be started. One of the following error message or similar message is displayed and recorded in [...]

Apache HTTPD No Space Left On Device Failed to Start Error

When restarting or starting the Apache HTTPD server in Linux web server, the startup failed and the following error occurred in error log: [error] (28)No space left on device: Cannot create SSLMutex Configuration Failed The error indicates [...]

Virtualmin Package Updates Install Failed (No More Mirrors to Try)

When updating Virtualmin managed packages, such as wbm-virtual-server (Webmin module for 'Virtualmin Virtual Servers (GPL)) to latest version, the installation of updates may failed. For example, when Virtualmin failed to update wbm-virtual-server, the following error message are [...]

How to Automatically Upgrade Installed Scripts Update on All Virtual Servers

Virtualmin provides webmasters with ability to install various scripts onto virtual servers to aid in managing of system components or quickly install popular web apps. These scripts include WHMCS, X2Engine, phpMyAdmin, phpPgAdmin, Django, RoundCube, SquirrelMail and etc. [...]

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