When QuickBooks attempts to open company files and the database connection verification fails, QuickBooks error code 6129,0 is shown. The company file cannot be opened by a QuickBooks user as a result of the issue. The software is unable to locate the computer or server that hosts the file if there is a network issue in the network it uses. When creating or opening a company file for QuickBooks Desktop, you can receive the following error message. “Error code: 6129, 0: Database connection verification failure”. In this article, we'll talk about how to fix QuickBooks issue 6129,0, and its potential causes. Read More: