Welcome to the Community, tdc22. Let's go through some troubleshooting steps to fix this issue.

This is usually caused by Windows firewall and security settings. The system requirement changes with each new version of QuickBooks. That said, we can check if your security and firewall setting are set correctly for QuickBooks Desktop.

To start, we can download and install most recent version (1.5.0.0) QuickBooks Tools Hub. After that, run QuickBooks File Doctor to check and fix any firewall issues.

Here's how:

1. From the tool hub, go to Company File Issues.
2. Click on Run QuickBooks File Doctor. It can take up to one minute for the file doctor to open. If the QuickBooks File Doctor doesn't open, search for QuickBooks Desktop File Doc and open it manually.
3. In QuickBooks File Doctor, select your company file from the dropdown menu. If you don’t see your file, select Browse and search to find your file.
4. Select Check your file and network and then Continue.
5. Put your QuickBooks admin password and then click Next.

If the issue still persists, you can proceed to Step 3 in this article to learn how you can configure firewall manually: Set up firewall and security settings for QuickBooks Desktop. This also contains additional troubleshooting steps for anti-virus or firewall settings.

Don't hesitate to leave a comment below. I'll be here to check if you still need further assistance. Take care and enjoy your weekend!