Guides tagged “troubleshooting”
Step-by-step MdmHost guides about troubleshooting, sorted A-Z.
178 guides · page 8 of 9
LiteSpeed Cache not working? How to check and fix it
Check whether LiteSpeed Cache is serving pages with the x-litespeed-cache header, and fix the common causes: cookies, no-cache headers, conflicting plugins and CDNs.
Node.js logs and debugging on cPanel and a VPS
Find where your Node.js app writes its logs on cPanel, PM2 and systemd, read crash messages, add useful logging and debug safely in production.
Not receiving emails in cPanel: causes and fixes
Emails not arriving in your cPanel mailbox? Learn how to check MX records, email routing, mailbox quota, filters and spam settings, and trace missing messages step by step.
Plesk website not loading? A step-by-step troubleshooting checklist
Work through DNS, SSL, hosting settings, PHP, logs, suspended subscriptions and server services to find why a website hosted on Plesk is down or showing errors.
Proxmox troubleshooting: fix common VE errors
Solve frequent Proxmox VE problems: locked VMs, web UI not loading, VMs that will not start, full storage, lost quorum, and network loss after configuration changes.
Read the error log and raw access logs in cPanel
Find the cause of website errors with cPanel's Errors tool, PHP error_log files and Raw Access logs, and learn how to read common log lines.
Read website logs and statistics in DirectAdmin
View access and error logs, bandwidth and disk usage, and AWStats or Webalizer statistics in DirectAdmin, and use them to find errors, bots and traffic spikes.
Recover a Linux VPS from a kernel panic
Diagnose and fix a Linux kernel panic on a VPS: read the panic message on the VNC console, boot an older kernel, rebuild the initramfs, fix fstab and recover from a rescue system.
Repair an unbootable Linux VPS from rescue mode with chroot
Boot a broken VPS into a rescue system, find and mount its disk, chroot into it, then fix common problems: bad fstab, broken GRUB, lost SSH access, full disk or a failed kernel update.
Reset a forgotten MySQL or MariaDB root password
Regain access to MySQL 8 or MariaDB when the root password is lost: check socket login first, then use skip-grant-tables safely and set a new password.
Search files on Linux with find and grep
Find files by name, size, age and owner with find, search inside files with grep, and combine both to track down large files, recent changes and suspicious code.
Server not responding? First checks before contacting support
A short checklist for an unreachable server: check its status in your VPS provider's control panel, test the network and port, look through the browser console, restart if needed and test from another network before opening a ticket.
Set up a serial console for KVM VMs (virsh console)
Enable a serial console in Linux KVM guests so you can reach them with virsh console without VNC or network: GRUB and kernel settings, getty, rescuing boot problems and exiting cleanly.
SMTP reply codes explained: 2xx, 4xx and 5xx email errors
How to read SMTP reply codes and enhanced status codes in bounces and logs, what common 421, 450, 550, 552 and 554 errors mean, and what to do about each one.
Start, stop, restart and power off a VPS in Virtualizor
Understand the difference between Stop, Restart and Power Off in Virtualizor, when to use each, and what to do when a VPS will not start or is stuck.
The dig command: DNS lookups explained with examples
Use dig to query A, MX, TXT, NS and other records, ask a specific nameserver, trace delegation from the root and check propagation, SPF, DKIM and DNSSEC.
Troubleshoot .htaccess problems: 500 errors, loops and ignored rules
Find and fix broken .htaccess files on cPanel and LiteSpeed hosting: syntax 500 errors, redirect loops, rules that do nothing and conflicts between plugins.
Troubleshoot a slow Windows VPS: CPU, RAM, disk and network
Find out why a Windows VPS is slow using Task Manager, Resource Monitor and PowerShell, then fix common causes like Windows Update, Defender scans and memory leaks.
Troubleshoot MTU problems: hanging pages, stuck SSH and slow VPNs
Recognise MTU and fragmentation problems, find the right MTU with ping, and fix it on Linux, Windows, WireGuard and Docker networks.
Troubleshoot Node.js apps in cPanel (CloudLinux Node.js Selector)
Fix common Node.js Selector problems in cPanel: app not starting, 503 errors, npm install failures, wrong Node version, missing modules and memory limit errors.
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- Getting startedYour first hour with a new server: access, logins and basics.83 guides
- cPanelFiles, databases, email, domains and every cPanel tool, step by step.67 guides
- WHM & resellingWHM, packages, reseller accounts, WHMReseller and running a hosting brand.53 guides
- WordPressInstall, secure, speed up, migrate and fix WordPress sites.49 guides
- Email & webmailMailboxes, webmail, forwarders, spam filters and email delivery.67 guides
- DomainsRegistering, transferring and managing domains and nameservers.27 guides
- SSL certificatesFree AutoSSL, Let's Encrypt, paid certificates and HTTPS.41 guides
- CloudLinuxCloudLinux setup and use: LVE limits, CloudLinux Manager, CageFS and PHP/Node.js selectors.31 guides
- LiteSpeedLiteSpeed Web Server, LSCache and the LiteSpeed Cache plugin: install, settings and tuning.35 guides
- Imunify360Malware scanning, firewall and proactive defence with Imunify360.24 guides
- SoftaculousInstall, update, clone and back up apps with Softaculous.24 guides
- WP SquaredcPanel's WordPress platform: sites, plugins, staging and backups.9 guides
- SitePadBuild and publish websites with the SitePad builder.9 guides
- SitejetDesign, edit and publish sites with the Sitejet builder.9 guides
- WHMResellerAlpha and master resellers with WHMReseller: install, setup and use.12 guides
- VirtFusionInstall, set up and manage VirtFusion: hypervisors, packages, servers and WHMCS integration.28 guides
- VirtualizorManage your VPS with Virtualizor: power, OS reinstall, VNC, IPs and backups.44 guides
- PleskWebsites, email, databases and settings in the Plesk panel.53 guides
- DirectAdminUsers, domains, email and reseller tools in DirectAdmin.41 guides
- WHMCSBilling, automation, products and client management with WHMCS.52 guides
- Control panelscPanel & WHM, Plesk, DirectAdmin and other panels on your VPS.107 guides
- SecurityKeys, passwords, firewalls and keeping a server patched.138 guides
- Networking & DNSIP addresses, reverse DNS, ports and traffic.72 guides
- Websites & appsWeb servers, WordPress, PHP, Node.js, SSL and app hosting.83 guides
- DatabasesMySQL, MariaDB, PostgreSQL, Redis and MongoDB on a VPS.80 guides
- Billing & accountInvoices, renewals, the client area and your account.9 guides
- TroubleshootingWhen something is not working: checks and fixes.127 guides
- Linux VPSSSH, packages, services and everyday Linux administration.265 guides
- Windows VPS & RDPRemote Desktop, Windows Server settings and Admin RDP tips.73 guides
- Docker & DevOpsContainers, Git deploys, automation, monitoring and backups.82 guides
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