I'm having a similar problem.
I am upgrading to QuickBooks 2018 Premiere, and trying to use QuickBooks with a dedicated Windows 10 Pro machine as server. That is a new and clean installation, and only the QuickBooks Database Server Manager is installed on the machine.
File sharing is working, and I can connect to the company file from a workstation.
However, both QuickBooks Database Server Manager and File Doctor give the following error message:
“Windows Firewall: Connection Sharing not allowed”
No third-party firewall or antivirus software is installed.
I have worked through the HOWTOs on installing QuickBooks for this type of installation, and on manually configuring the firewall. The necessary exceptions for both ports and applications seem to be present. Firewall logging shows no blocked ports.
I'm wondering if there could be an incompatibility between the current version of Windows 10 Pro and theQuickBooks Database Server Manager in QuickBooks 2018 Premiere.
Does anyone recognize the error message: “Windows Firewall: Connection Sharing not allowed”?
Any help would be very welcome!