PHP Execution Time Errors

Troubleshoot and resolve PHP Fatal error: Maximum execution time of 300 seconds exceeded in /path/to/file.php errors in WHMCS.

PHP Session Storage Errors

Troubleshoot and resolve `PHP session storage is not writeable. For help, contact your system administrator.` errors when logging in to the WHMCS Admin Area.

PHP Tag Errors

Troubleshoot and resolve errors caused by disallowed PHP tags in templates.

Plesk Connection Errors

Troubleshoot and resolve 503 Service Temporarily Unavailable, Page not Found, Timeout, or 502 Bad Gateway errors.


POP3 [AUTH] Errors

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®.

POP3 Cron Not Running

Troubleshoot and resolve a POP3 cron not running emails and WHMCS Pop Cron Did Not Run errors.

POP3 General Error 3988 Errors

Troubleshoot and resolve General error: 3988 Conversion from collation utf8mb3_unicode_ci into latin1_swedish_ci impossible for parameter errors.






Quantum Vault Missing Ending Errors

Troubleshoot and resolve Missing the following: Ending /QGWRequest, Ending /Authentication, Ending /GatewayKey errors while using the Quantum Vault payment gateway module.

Query String URI Errors

Troubleshoot and resolve InvalidArgumentException: Query string must not include a URI fragment errors.