Guides tagged “troubleshooting”
Step-by-step MdmHost guides about troubleshooting, sorted A-Z.
80 guides · page 2 of 4
Fix "503 Service Unavailable" on LiteSpeed hosting
Find and fix 503 Service Unavailable errors on LiteSpeed cPanel hosting: PHP processes failing to start, resource limits, crashed PHP extensions, and timeouts in long scripts.
Fix "508 Resource Limit Is Reached" on CloudLinux hosting
Why a website shows 508 Resource Limit Is Reached on CloudLinux, how to find which limit was hit in Resource Usage, and the fixes that stop it coming back.
Fix "Bandwidth Limit Exceeded" on a cPanel account
Why a site shows Bandwidth Limit Exceeded, how resellers check and raise the monthly bandwidth limit in WHM, and how to find what is using the traffic.
Fix "cPanel license invalid" or licence not found errors
Fix cPanel licence invalid or licence not found errors on a VPS. Check the IP on verify.cpanel.net, open outbound connections, fix DNS and time, and refresh with cpkeyclt.
Fix "Error establishing a database connection" in WordPress
Fix the WordPress database connection error: check wp-config.php credentials, the cPanel database user and privileges, repair tables and rule out server limits.
Fix "HTTP error" and failed image uploads in WordPress
Fix WordPress media uploads that fail with "HTTP error", "exceeds the maximum upload size" or "unable to create directory": limits, permissions, image libraries and plugins.
Fix "No space left on device" when the disk isn't full (inodes)
Linux says no space left on device but df -h shows free space? Use df -i to confirm inode exhaustion, find the folder with millions of files and clean it up safely.
Fix "Remote Desktop can't connect to the remote computer"
Check the server is running, test the RDP port, rule out network blocks and repair Remote Desktop settings from the browser console.
Fix "There has been a critical error on this website"
Recover from the WordPress critical error message: use the recovery mode email, find the failing plugin or theme in the logs and get back into the dashboard.
Fix 403 Forbidden errors caused by ModSecurity (Imunify360 WAF)
Recognise when the Imunify360 web application firewall blocks a legitimate form or admin action with a 403 error, collect the details and get the rule fixed.
Fix 403 Forbidden errors on cPanel hosting
Solve 403 Forbidden on a cPanel website: missing index file, wrong permissions, .htaccess deny rules, IP Blocker entries, hotlink protection or ModSecurity blocks.
Fix 403 Forbidden in Nginx
Nginx returns 403 Forbidden when it will not serve a file or folder. Work through the usual causes, from a missing index file to permissions, deny rules and SELinux.
Fix 404 Not Found errors on cPanel hosting
Find why pages return 404 Not Found on a cPanel site: wrong document root, case-sensitive file names, missing rewrite rules, moved pages, and custom error pages.
Fix 502 Bad Gateway in Nginx
A 502 Bad Gateway means Nginx could not get a valid answer from PHP-FPM or your app. Read the error log, then check the backend service, socket path, permissions and ports.
Fix a 500 Internal Server Error in WordPress
Troubleshoot a WordPress 500 Internal Server Error on cPanel: check error logs, reset .htaccess, fix PHP settings and permissions, and isolate plugins or the theme.
Fix a 500 Internal Server Error on cPanel hosting
Find and fix the cause of a 500 Internal Server Error on any cPanel site: broken .htaccess rules, wrong permissions, PHP version or memory problems and script errors.
Fix common errors when creating cPanel accounts in WHM
Solutions for the errors resellers see most when creating cPanel accounts in WHM: domain already exists, username taken, out of allocation, package limits and DNS problems.
Fix common Node.js errors: EADDRINUSE, 503, out of memory, module not found
Fix the Node.js errors hosting customers see most: port already in use (EADDRINUSE), 503 on cPanel, JavaScript heap out of memory and Cannot find module.
Fix common Plesk problems yourself with Repair Kit
Use the Plesk Repair Kit extension to restart services, fix file permissions, repair databases and check DNS, and learn the admin plesk repair command for deeper fixes.
Fix common SSL errors in the browser
Understand and fix common browser SSL errors: name mismatch, expired or untrusted certificates, incomplete chains, protocol errors and HTTPS redirect loops.
Browse by topic
- Getting startedYour first hour with a new server: access, logins and basics.69 guides
- cPanelFiles, databases, email, domains and every cPanel tool, step by step.37 guides
- WHM & resellingWHM, packages, reseller accounts, WHMReseller and running a hosting brand.49 guides
- WordPressInstall, secure, speed up, migrate and fix WordPress sites.40 guides
- Email & webmailMailboxes, webmail, forwarders, spam filters and email delivery.37 guides
- DomainsRegistering, transferring and managing domains and nameservers.20 guides
- SSL certificatesFree AutoSSL, Let's Encrypt, paid certificates and HTTPS.19 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.30 guides
- Imunify360Malware scanning, firewall and proactive defence with Imunify360.23 guides
- SoftaculousInstall, update, clone and back up apps with Softaculous.23 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.7 guides
- VirtualizorManage your VPS with Virtualizor: power, OS reinstall, VNC, IPs and backups.30 guides
- PleskWebsites, email, databases and settings in the Plesk panel.52 guides
- DirectAdminUsers, domains, email and reseller tools in DirectAdmin.40 guides
- WHMCSBilling, automation, products and client management with WHMCS.51 guides
- Control panelscPanel & WHM, Plesk, DirectAdmin and other panels on your VPS.106 guides
- SecurityKeys, passwords, firewalls and keeping a server patched.115 guides
- Networking & DNSIP addresses, reverse DNS, ports and traffic.34 guides
- Websites & appsWeb servers, WordPress, PHP, Node.js, SSL and app hosting.52 guides
- DatabasesMySQL, MariaDB, PostgreSQL, Redis and MongoDB on a VPS.64 guides
- Billing & accountInvoices, renewals, the client area and your account.9 guides
- TroubleshootingWhen something is not working: checks and fixes.68 guides
- Linux VPSSSH, packages, services and everyday Linux administration.70 guides
- Windows VPS & RDPRemote Desktop, Windows Server settings and Admin RDP tips.58 guides
- Docker & DevOpsContainers, Git deploys, automation, monitoring and backups.58 guides
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