Intuit created the ( https://opencloudmanifesto.org/quickbooks-connection-diagnostic-tool/ ) quickbooks connection diagnostic tool to solve networking and multi-user issues in QuickBooks, which typically occur when accessing a corporate file. This allows QuickBooks Database Manager and QuickBooks company files to communicate properly. The tool's most common version is 4.0, which is free to download. And only function with QuickBooks 2008 and newer or QuickBooks Enterprise Solutions 8.0 and newer on systems running Microsoft Windows 7, Windows Vista, or Windows XP. The tool's location can be easily identified by looking for QBNetDiagTool.exe and QBServerUtilityMgr.exe.

I have been using QuickBooks for my accounting. But, when I was installing this tool on my new desktop, I got some technical errors but then I got to know about the QuickBooks diagnostic tool. It helped me fix the errors. Check the website for more.
https://opencloudmanifesto.org/quickbooks-install-diagnostic-tool/