Undefined curl_init() Function ErrorsTroubleshoot and resolve Call to undefined function curl_init() errors.
Undefined Method Importing ErrorsTroubleshoot and resolve Call to undefined method getRawHeader() errors.
Undefined PHPMailer Function ErrorsTroubleshoot and resolve Call to undefined function PHPMailer HPMailerscapeshellarg() errors.
Unexpected Next Due DateTroubleshoot and resolve unexpected changes to a service's Next Due Date value.
Unexpected PayPal Cancellation EmailsTroubleshoot and resolve issues with customers receiving unexpected subscription cancellation emails from PayPal®.
Unexpected Service SuspensionsThe system is unexpectedly suspending services (for example, hosting accounts).
Unexpected Service TerminationsThe system is unexpectedly terminating services (for example, hosting accounts).
Unregistered Address ErrorsTroubleshoot and resolve The sender's email address is not registered errors.
Unsupported Protocol ErrorsTroubleshoot and resolve This Plesk server does not support XML API protocol version errors.
Update Channel ErrorsTroubleshoot and resolve Make certain that you have selected a valid Update Channel and then try again errors.
Update Dry Run ErrorsTroubleshoot and resolve Apply update dry-run detected permission issues errors.