RunCloud Blog

If you’re seeing Cloudflare HTTP Error 526 (Invalid SSL Certificate) on your site, it means Cloudflare couldn’t verify the SSL certificate on your server. The result is that your visitors are blocked from accessing your website until it’s fixed. In this guide, we’ll show you how to fix the Cloudflare HTTP Error 526 step by step. …

Running out of disk space on a Linux server can slow your applications down. Databases stop writing, logs stop recording, and sometimes, you can’t even log in. That’s why knowing how to check disk space in Linux is a basic but critical skill for anyone managing servers. In this guide, we’ll show you the exact commands …

Learning how to change your WordPress site URL is a common need for site owners. Whether you’re moving to a new domain, switching to HTTPS, or taking a site live from staging, updating your URL settings is essential. Many guides make this process sound complicated, involving database edits or risky changes to configuration files. But …

Whether you’re running Ubuntu, Arch, Debian, or any other Linux distribution, knowing how to quickly and accurately identify your OS version can be the difference between smooth operations and compatibility nightmares. And knowing your Linux OS version precisely is essential when troubleshooting a software installation, planning a system upgrade, or ensuring security patch compatibility. This …

Seeing “This site can’t provide a secure connection” with the ERR_SSL_PROTOCOL_ERROR message can stop you in your tracks. For developers, agencies, or site owners, it’s more than an inconvenience – it can mean downtime, lost visitors, and support tickets piling up. This guide explains what the error means, why it happens, and how to fix it …

Are you tired of unresponsive programs, resource-hogging applications, or rogue processes slowing your Linux system down? While knowing how to kill a process on Linux from the command line is a fundamental skill for any Linux user, the story doesn’t end with a simple kill command. What if you can’t find the process ID (PID)? …

Few WordPress errors are as frustrating as seeing the message “Error Establishing a Database Connection.” It instantly takes your site offline, blocks both visitors and admins, and can cause serious downtime if not resolved quickly. This error occurs when WordPress cannot connect to your MySQL database, where all your posts, pages, and settings are stored. …

On Linux, disk space can disappear fast. This guide shows you how to spot the biggest files and directories quickly, understand size mismatches, and free up space safely. How Do You Check Disk Usage With Built-In Linux Tools? In Linux Bash, you have several built-in utilities and commands that you can use to check and …

DNS cache can speed up internet access and improve browsing experiences by storing recent domain name lookups and their corresponding IP addresses. Clearing this cache periodically can enhance your browsing speed and resolve connectivity issues. Modern operating systems generally cache DNS lookup results and IP addresses to process requests more quickly. Whenever you write a …