It can take up to one minute for the file doctor to open. From the tool hub, go to Company File Issues.After that, run QuickBooks File Doctor to check and fix any firewall issues. To start, we can download and install most recent version (1.5.0.0) QuickBooks Tools Hub. That said, we can check if your security and firewall setting are set correctly for QuickBooks Desktop. The system requirement changes with each new version of QuickBooks. This is usually caused by Windows firewall and security settings. Let's go through some troubleshooting steps to fix this issue.