WHMCS Tags troubleshooting-article Troubleshoot and resolve last request failed: [AUTH] Username and password not accepted errors in POP3 Connection Error notification emails while working with email importing from Google®. Troubleshoot and resolve a POP3 cron not running emails and WHMCS Pop Cron Did Not Run errors. Troubleshoot and resolve General error: 3988 Conversion from collation utf8mb3_unicode_ci into latin1_swedish_ci impossible for parameter errors. Troubleshoot and resolve Error: read failed - connection closed? errors. Troubleshoot and resolve issues with pricing displaying incorrectly in the shopping cart. Troubleshoot and resolve Product attribute Package Name XXX Not Found on Server errors. Troubleshoot and resolve Required Product Module Missing errors. Troubleshoot and resolve the `This product is temporarily unavailable` error at checkout for WebPros Partner products. Troubleshooting and resolving MarketConnect promotion display issues. Troubleshoot and resolve Missing the following: Ending /QGWRequest, Ending /Authentication, Ending /GatewayKey errors while using the Quantum Vault payment gateway module. Troubleshoot and resolve InvalidArgumentException: Query string must not include a URI fragment errors. How to troubleshoot question marks replacing text in PDF invoices and quotes. Troubleshoot and resolve cross-selling recommendations that are not displaying properly. Troubleshoot and resolve redirect loops. Troubleshoot and resolve the messages that stop a new WHMCS installation when the configuration.php file already contains database details. Troubleshoot and resolve issues with Automatic Domain Registration on Payment Suppressed errors. Troubleshoot and resolve issues when an admin's Remember Me session ends and the system prompts them to log in again. Troubleshoot and resolve Remote Transaction Failure. Please Contact Support. errors. Troubleshoot and resolve Required function is not available errors. Troubleshoot and resolve Resellers are not permitted to create subdomains of the server's main domain errors.