Hello there, @alexsupertramp.

Since you confirmed that your internet connection is stable, let's install QuickBooks Tool Hub to fix the issue and access your account in QuickBooks Desktop (QBDT). Let me guide you through the steps:

Before we install the QuickBooks Tool Hub, right-click the QBDT icon in your screen, then select Run as Administrator. If you still can't log in, we will download and install the QuickBooks Tool Hub. This will help us identify any component issues related to your QBDT.

Here's how:

1. Close your QBDT.
2. Download and install the most recent version (1.6.0.8) of the QuickBooks Tool Hub.
3. From the tool hub, select Company File issues.
4. Click 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.
5. In QuickBooks File Doctor, select your company file from the dropdown menu. If it does not appear, select Browse and search to find your file.
6. Select Check your file and network, and then Continue.
7. Put in 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 the firewall manually: Set up firewall and security settings for QuickBooks Desktop. This also contains additional troubleshooting steps for anti-virus or firewall settings.

I also included an article if you want to add user with a specific role to manage your books: Create and manage users and roles in QuickBooks Desktop Enterprise.

If you require more assistance with accessing your QBDT, please feel free to click the Reply button below. The Community is always available to help you navigate any challenges you may face.