QuickBooks Error 15215: Causes and Step-by-Step Solutions A payroll update error known as QuickBooks Error 15215 occurs when the program has trouble confirming the digital signature of a file. Incorrect system settings or incompatible background apps are frequently the cause of this problem. Payroll services may be interrupted, and a notification stating that the server connection cannot be established or validated is usually displayed.If you experience any problems, call the QB support team at 1.855.738.2784.URL ;https://www.deviantart.com/kimwatson332/journal/Guide-To-Quickly-Eliminate-QuickBooks-Error-15215-1151886458