Greetings to everybody. My name is Sasha, and I work as a customer service representative. 'QuickBooks error 3371 code 11118' is a frequently reported issue by QuickBooks customers. The most common cause of 'QuickBooks problem 3371 code 11118' is that you are using an outdated version of Windows. QB may not be compatible with previous versions of Windows, and there is a network problem.