Thanks for getting back to us, @PTI Phil. I want to ensure this issue is sorted out so you can get back to business.

QuickBooks Desktop doesn't require specific IP addresses or servers for the license to sync. However, it does require an internet connection at least once every 14 days to verify the licensing status. As long as the computer running QuickBooks Desktop has periodic internet access, the license should remain synced and up-to-date.

To acquaint you with the prerequisites, review and examine this information: QuickBooks Desktop Enterprise Specifications

I've also added this great source where you can find articles that can help you with managing your books in QuickBooks. Please head to the QBDT self-help articles. This includes topics such as reconciliation, tracking income and expenses, running reports, etc.

Don't hesitate to join us again here in the Community or reply to me if you have other questions while working in QuickBooks. We're always here to help.

Should you need additional assistance in doing any of your QBDT tasks that you can't find in the articles, please leave a reply below. I'll take every opportunity to help you achieve your goals. Have a good day and keep safe always.