QuickBooks Error 80040408 is a common Error that occurs when communicating with the QuickBooks online services occurs. This error is usually caused by an incorrect system date and time, an outdated version of QuickBooks, or an internet connection problem. check and correct the system date and time, update QuickBooks to the the latest version, and check the internet connection settings to solve this issue. QuickBooks is an accounting software used by small businesses to manage their financial transactions and records.For instant assistance contact to our QuickBooks Experts Team at 1.855.738.2784.