Guides tagged “troubleshooting”
Step-by-step MdmHost guides about troubleshooting, sorted A-Z.
80 guides · page 3 of 4
Fix Docker daemon not starting
Docker service failed to start? Read the real error with journalctl, then fix an invalid daemon.json, conflicting options, storage driver and overlay errors, a full disk or iptables problems.
Fix ERR_TOO_MANY_REDIRECTS: diagnose a redirect loop
Trace an ERR_TOO_MANY_REDIRECTS loop across Nginx, Apache, WordPress and Cloudflare, and find the single rule that keeps sending traffic back to itself.
Fix file upload size errors on cPanel (upload_max_filesize, 413)
Fix 'file exceeds upload_max_filesize', 413 Request Entity Too Large and failed uploads on cPanel by raising PHP limits correctly, or using FTP for very large files.
Fix MySQL or MariaDB error 1045: Access denied for user
Error 1045 means MySQL or MariaDB rejected the login. Find which user and host the client asked for, fix the password or grants, and reset a lost root password safely.
Fix Nginx failed to start: address already in use
Nginx will not start when another program already holds port 80 or 443. Find what is using the port with ss, stop or move it, fix duplicate listen lines, then start Nginx.
Fix PHP "Allowed memory size exhausted" fatal error
PHP stops a script when it tries to allocate more memory than memory_limit allows. Find the script that hit the limit, raise the limit in the right place, and fix the cause.
Fix SSH "connection refused", "timed out" and "permission denied"
Work out what each SSH error means, test the port from your computer, and use the control panel's browser console to fix the firewall, the SSH service or key permissions.
Fix the WordPress login redirect loop
Fix WordPress sending you back to the login page after a correct password: cookies, site URL mismatches, HTTPS settings, caching, plugins and corrupt .htaccess rules.
Fix the WordPress white screen of death
Fix a blank white WordPress page step by step: find the error in the logs, disable plugins and the theme from File Manager, raise memory and restore if needed.
Fix WordPress permalinks and 404 errors on posts
Fix WordPress posts and pages that return 404 while the home page works: re-save permalinks, restore the .htaccess rules and check rewrite conflicts in cPanel.
Fix WordPress stuck in maintenance mode
Remove the "Briefly unavailable for scheduled maintenance" message after a failed update by deleting the .maintenance file, then finish the update safely.
FTP connection failed? Fix FileZilla and FTP login errors
Fix FTP errors such as "530 Login authentication failed", connection timeouts and "Failed to retrieve directory listing" when connecting to cPanel hosting.
Get instant answers with MdmHost AI
Use MdmHost AI at /ai for setup and troubleshooting questions at any time, learn how to ask questions that get useful answers, and know when to open a support ticket instead.
High CPU or RAM usage on a Linux VPS: find the cause and fix it
Track down what is eating CPU or memory on your Linux VPS with top, ps and logs, then fix runaway PHP, MySQL, bots, Docker containers or a lack of swap.
How to read server logs to troubleshoot your website
Where to find web, PHP, mail, database and system logs on cPanel hosting and a Linux VPS, and how to search them quickly to find the cause of an error.
How to run and read an MTR report (packet loss and latency)
Run MTR or WinMTR, then read loss, latency and jitter per hop correctly so you can tell real network problems from harmless router behaviour.
How to write a support ticket that gets solved fast
Write support tickets that get solved on the first reply by including the service, IP address, exact error text, steps already tried and screenshots, without ever pasting passwords.
Is your ISP or router blocking port 3389? How to tell
Work out whether your internet provider, home router, parental controls or a proxy is blocking RDP port 3389, and collect the details support needs to help.
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.
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
Still stuck?
Ask MdmHost AI for a quick answer, or open a ticket and our team will take a look. We are here 24/7.