Guides & Tutorials
Browse our easy to follow guides and tutorials that demonstrate how to use WHMCS and resolve common problems.
Topics
-
Simple 13
- Troubleshooting a Blank Page/Oops Error Message
- Troubleshooting Login Problems
- Troubleshooting Warning Messages
- How to refresh admin dashboard widgets
- Resolving Attention Items on the System Health Status Page
- Resolving Warnings on the System Health Status Page
- Troubleshooting a Redirect Loop
- Blocking Spam Orders
- Troubleshooting Clients Unable to Login
- Troubleshooting Twitter Sign-In Integrations
- Troubleshooting Facebook App Review Requests
- Troubleshooting Installation Issues
- Troubleshooting Problems Accepting EULA After Update
-
Advanced 12
- How to Resolve A Certificate Authority Verified SSL Certificate Was Not Detected on example.com
- Troubleshooting Domain Availability Check Problems
- Troubleshooting Order Form Issues
- Troubleshooting Unsupported Protocol Errors (TLS Support)
- Troubleshooting an Order Not Found...Exiting... Error
- Troubleshooting Server IP Address Appearing in Client Logs
- Troubleshooting & Debugging Hooks
- Resolving a Base table or view not found Error
- Troubleshooting and Debugging WHMCS API Calls
- Troubleshooting Frequent Logouts
- Sending Failed. Please see documentation SendEmail API response
- Troubleshooting Admin Directory Errors
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Common Errors 18
- Troubleshooting CURL Error: 56 - OpenSSL SSL_read: Success error
- Troubleshooting ionCube Errors
- Troubleshooting Question Marks in PDF Invoices and Quotes
- Troubleshooting an "Allowed memory size exhausted" Error
- Troubleshooting Impossible to create the root directory Errors
- Troubleshooting a 404 Page Not Found Error
- Troubleshooting reCAPTCHA Invalid Domain for Site Key
- Troubleshooting CURL Error: 56 - OpenSSL SSL_read unexpected eof while reading
- Troubleshooting an InvalidArgumentException: Data missing in Carbon.php:425 Error
- An error occurred while communicating with the server. Please try again
- Troubleshooting a Critical Error - Could not connect to the database Error
- Troubleshooting an Argument 1 passed ... must be an instance of PDOStatement Error
- Troubleshooting a Failed Opening Required file Error
- Troubleshooting a Duplicate entry '0' for key 'PRIMARY' Error
- Troubleshooting an Access Denied - Forbidden Error
- Troubleshooting an TypeError: Argument 1 passed to Carbon\CarbonInterval::setLocalTranslator() Error
- Troubleshooting a The template could not be found Error
- Troubleshooting a You are currently accessing the admin area using an insecure connection Notice
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Email Troubleshooting 7
- Troubleshooting Email Sending Problems for WHMCS 7.x
- Troubleshooting Welcome Email Sending Issues
- Troubleshooting Email Sending Problems
- Troubleshooting Administrators Not Receiving Support Ticket Notification Emails
- Connection unsuccessful. Please close this window and try again with Microsoft
- URL may not contain a query string with Microsoft
- SMTP connect() failed Error with External SMTP Mail Providers
Other Resources
- Installing WHMCS
- Setup and Configuration
- Updating WHMCS
- System Settings
- Cron & Automation
- Payments & Currency
- Order Forms
- Localisation
- Managing Clients, Services and Domains
- Troubleshooting
- Provisioning/Modules
- Support Tools
- Customisation
- Security
- MarketConnect
- 8.2 Update
- 8.3 Update
- 8.4 Update
- 8.5 Update
- 8.6 Update